> ultrasonic humidifier

Help your little ones breathe easier by adding moisture to the air with our adorable Dolphin humidifier. A humidifier will help achieve the ideal conditions to sleep well at night and provides year-round relief from the drying effects of AC and Heater. Ultrasonic technology makes it noiseless and the fine atomization lasts about 8 to 10 hours. Features super-quiet operation, overflow protection and auto shut-off protection (with no audible alarm) - the perfect addition to any room. Features and Functions : Cool mist (ultrasonic technology) High humidity output Silent operation Adjustable mist intensity Auto shut-off protection (ultrasonic generator only - fan will continue to run) 1.4 liters tank capacity Steam emission autonomy: 8 to 10 hours Designed for rooms up to 450 sq. ft. No-slip feet Adorable design ETL Input Voltage: 120V AC Power: 21 Watts Dimension: 14.5 x 6 x 8 in. Weight: TBD Warranty : One Year *** Click here to visit Humidifier Section to see more ***

Help your little ones breathe easier by adding moisture to the air with our adorable Orca humidifier. A humidifier will help achieve the ideal conditions to sleep well at night and provides year-round relief from the drying effects of AC and Heater. Ultrasonic technology makes it noiseless and the fine atomization lasts about 8 to 10 hours. Features super-quiet operation, overflow protection and auto shut-off protection (with no audible alarm) - the perfect addition to any room. Features and Functions : Cool mist (ultrasonic technology) High humidity output Silent operation Adjustable mist intensity Auto shut-off protection (ultrasonic generator only - fan will continue to run) 1.4 liters tank capacity Steam emission autonomy: 8 to 10 hours Designed for rooms up to 450 sq. ft. No-slip feet Adorable design ETL Input Voltage: 120V AC Power: 21 Watts Dimension: 14.5 x 6 x 8 in. Weight: TBD Warranty : One Year *** Click here to visit Humidifier Section to see more ***

Compact and lightweight, this personal humidifier offers portability that is perfect for travel use. Small enough to easily fit in your luggage or carry on. Two different sized bottle adapters and a 100~240V AC adapter allows universal usage. All you need to obtain at destination is a bottle of water. Also ideal for use at work, in nursery or for anyone who desires its convenience and portability. Ultrasonic technology offers cool mist and quiet operation. Features and Functions : Cool mist (ultrasonic technology) 120cc per hour humidity output at "Hi" Setting Auto stop when water is out, LED turn Red Adjustable mist Uses water bottle instead of water tank Water low indicator Super Quiet operation Low power consumption UL approved Universal AC adapter 2 Bottle adapter included Specifications : Input voltage: 120V/240V ~ 50/60Hz Power Consumption: 15W Unit Dimension (W x L x H) inch: 4 x 2.5 x 3 Net Weight: 0.5 lb Power adapter Weight: 0.4 lb Package Weight: 1.4 lbs Warranty : One Year *** Click here to visit Humidifier Section to see more ***

Compact and lightweight, this personal humidifier offers portability that is perfect for travel use. Small enough to easily fit in your luggage or carry on. Two different sized bottle adapters and a 100~240V AC adapter allows universal usage. All you need to obtain at destination is a bottle of water. Also ideal for use at work, in nursery or for anyone who desires its convenience and portability. Ultrasonic technology offers cool mist and quiet operation. Features and Functions : Cool mist (ultrasonic technology) 120cc per hour humidity output at "Hi" Setting Auto stop when water is out, LED turn Red Adjustable mist Uses water bottle instead of water tank Water low indicator Super Quiet operation Low power consumption UL approved Universal AC adapter 2 Bottle adapter included Specifications : Input voltage: 120V/240V ~ 50/60Hz Power Consumption: 15W Unit Dimension (W x L x H) inch: 4 x 2.5 x 3 Net Weight: 0.5 lb Power adapter Weight: 0.4 lb Package Weight: 1.4 lbs Warranty : One Year *** Click here to visit Humidifier Section to see more ***

Compact and lightweight, this personal humidifier offers portability that is perfect for travel use. Small enough to easily fit in your luggage or carry on. Two different sized bottle adapters and a 100~240V AC adapter allows universal usage. All you need to obtain at destination is a bottle of water. Also ideal for use at work, in nursery or for anyone who desires its convenience and portability. Ultrasonic technology offers cool mist and quiet operation. Features and Functions : Cool mist (ultrasonic technology) 120cc per hour humidity output at "Hi" Setting Auto stop when water is out, LED turn Red Adjustable mist Uses water bottle instead of water tank Water low indicator Super Quiet operation Low power consumption UL approved Universal AC adapter 2 Bottle adapter included Specifications : Input voltage: 120V/240V ~ 50/60Hz Power Consumption: 15W Unit Dimension (W x L x H) inch: 4 x 2.5 x 3 Net Weight: 0.5 lb Power adapter Weight: 0.4 lb Package Weight: 1.4 lbs Warranty : One Year *** Click here to visit Humidifier Section to see more ***

The Germ Guardian™ Digital Ultrasonic Humidifier (H3000) uses nano-silver technology to fight the growth of mold and bacteria in the water tank. The Digital Ultrasonic Humidifier senses the humidity in the environment and automatically adjusts to a pre-set level and has an option for warm or cold humidification. An adjustable spray function helps regulate the volume of spray you desire. And since the humidifier is ultrasonic it's virually silent when it runs ‚ making it ideal to have on while you sleep.

Compact and lightweight, this personal humidifier offers portability that is perfect for travel use. Small enough to easily fit in your luggage or carry on. Built-in Ionizer purifies the air by removing bacteria, allergens and contaminants. Two different sized bottle adapters and a 100~~240V AC adapter allows universal usage. All you need to obtain at destination is a bottle of water. Also ideal for use at work, in nursery or for anyone who desires its convenience and portability. Ultrasonic technology offers cool mist and quiet operation.. Features and Functions : Cool mist (ultrasonic technology) Built-in Ionizer Carrying pouch included 80ml per hour humidity output Humidity capacity: 7hrs/500ml bottle Ion numbers: 300,000/cubic cm Adjustable mist Uses water bottle instead of water tank Auto stop when water is out, LED turn Red Water low indicator Super Quiet operation Low power consumption UL approved Universal AC adapter Specifications : Input voltage: 120V/240V ~ 50/60Hz Power : DC 24V Unit Dimension (W x L x H) inch: 5.75 x 2.95 x 2.6 Net Weight: 0.75 lb Warranty : One Year *** Click here to visit Humidifier Section to see more ***

SquareTrade © AP6.0 Brand New Units. Shipped from the Air O Swiss warehouse direct. Units will ship via Ground. Units will only be shipped to locations within the continental U.S. We are a Air-O-Swiss Authorized dealer. Purchase comes with a full manufacturer warranty. Ultrasonic U7145 Humidification System This ultrasonic humidifier uses high-frequency vibrations to turn the water into a micro-fine mist which is blown into the room, where it immediately evaporates. Ultrasonic humidifiers cons

Introducing the Whole Room Ultrasonic Humidifier, created by the minds that revolutionized air circulation. Never before has Vornado’s signature Vortex Action been incorporated with Ultrasonic Humidifier Technology, maximizing humidity distribution. How is it different? All Ultrasonic humidifiers use ultrasonic frequency to break water into microscopic droplets. But this is where most stop. Our engineers have added a powerful Vortex beam of air to quietly propel the moisture out into the room for more efficient humidification. Vornado provides Whole Room Humidification. By incorporating Vornado’s signature Vortex Technology, the Vornado Ultrasonic Humidifier moves large volumes of harsh, dry air through the unit and then pushes the moistened air further out into the room, providing complete and even humidification. It also recovers and circulates heat off of the ceiling for even room temperature. Delivers cool or warm mist and has user defined settings that allow you to choose your desired humidity level and fan speed. The humidistat provides automatic humidity control and the large 2 gallon capacity makes for less refills. Provides coverage up to 1250 sq. ft. 5 year limited warranty.

Introducing the Whole Room Ultrasonic Humidifier, created by the minds that revolutionized air circulation. Never before has Vornado’s signature Vortex Action been incorporated with Ultrasonic Humidifier Technology, maximizing humidity distribution. How is it different? All Ultrasonic humidifiers use ultrasonic frequency to break water into microscopic droplets. But this is where most stop. Our engineers have added a powerful Vortex beam of air to quietly propel the moisture out into the room for more efficient humidification. Vornado provides Whole Room Humidification. By incorporating Vornado’s signature Vortex Technology, the Vornado Ultrasonic Humidifier moves large volumes of harsh, dry air through the unit and then pushes the moistened air further out into the room, providing complete and even humidification. It also recovers and circulates heat off of the ceiling for even room temperature. Delivers cool or warm mist and has user defined settings that allow you to choose your desired humidity level and fan speed. The humidistat provides automatic humidity control and the large 2 gallon capacity makes for less refills. Provides coverage up to 1250 sq. ft. 5 year limited warranty.

This compact humidifier easily fits on a desk or nightstand, and uses ultrasonic vibrations to generate a fine cool mist that evaporates immediately once it is blown into the air, providing the immediate area with humidity during arid winter conditions. The quiet unit prevents microbial growth using high-frequency vibrations and the natural properties of silver to sanitize the water chamber so only clean mist is emitted. The detachable 1/4-gallon water reservoir is easy to fill, and it has a gentle blue light. 8 1/2" H x 8" W x 3 1/2" L. (2 lbs.)

WindChaser HUL30 Features: -Ultrasonic humidifier with light. -Combination of grey and blue colors. -Compact design. -Two settings high and low. -Visible blue and green light to illuminate the mist. -Ultrasonic cool mist humidifier. -Applicable area: 161.45 feet. Specifications: -Mist capacity: 2.5 Oz / hr. -Water tank capacity: 30.43 Oz. -Energy efficient. -Comes with household UL listed plug and car adapters. -Overall dimensions: 6.89" H x 6.06" W x 9.88" D.

Eliminate harsh and dry air in style with the Bionaire BU5001Q-U-035 Ultrasonic Silent Visible Mist Vase Humidifier. This humidifier comes in a simple vase design with brushed aluminum accents. The control panel allows you to select visible mist and the filter free operation means no hassle with filter replacement. The humidifier works in virtually silent operation for your comfort and convenience. Ultrasonic technology produces ultra-fine, visible mist that quickly disperses humidity into the room with the use of a transducer which atomizes the water. Microban antimicrobial product protection is infused into the humidifier housing and filter to help prevent the growth of bacteria that can cause stains and odors or adversely affect filter performance. Includes Manufacturer's Warranty.

Improve your health with the Bionaire BU4000-UC Small Room Ultrasonic Humidifier. Bionaire humidifiers help keep the air in your room from being too dry. Avoid the unpleasantness of chapped lips, cracked skin and static electricity by making sure your room has enough moisture in its atmosphere. Excellent for small rooms, the Bionaire ultrasonic humidifier runs up to 24 hours on one filling. The touch screen control, view mist window, and visible mist are also featured on this model. Mist view window allows you to see if the mist is produced. Includes two removable water tanks with carry handle. Also features automatic shut-off when water level is low or mist channel is positioned incorrectly. The elegant original design fits perfectly in any decor. Dimensions: 13.6" x 12.7" x 15.3" (L x W x H). Includes Manufacturer's Warranty.

to determine shipping costs for multiples use the shipping cost calculator link above "see more services" (the link is just to the right of the listing photo ) ***enter your Zip Code and quantity *** to find shipping costs and transit options ideal for home or office use perfect for travel keeps skin moisturized new in box Wind Chaser® hu mini fier Personal Ultrasonic Humidifier cool mist humidification anti-bacterial water filter quiet operation power adaptors for home and car use replace

Put an end to dry, itchy skin and alleviate congestion with the new Coway MHS-E5010X Leo room humidifier! This quiet and compact unit utilizes both warm mist and ultrasonic humidification technologies in order to deliver soothing relief. A specially- designed iodine filter also eliminates bacteria and removes mineral build-up from hard water. Combination Humidifier: The MHS-E5010X features both warm mist and ultrasonic humidification technologies -- you choose which humidification method you prefer. Air Filter Removes Pollutants: The Coway Leo ultrasonic humidifier?s air filter removes dust, pollen, and odors from your air. Digital Controls: The MHS-E5010X has an advanced digital control panel and feature 4 different speed settings as well as several operation modes.Compact: The Leo humidifier boasts a compact design that easily fits in most spaces.

Ultrasonic, Cool-Mist Humidifier, 3500X Programmable Humidistat to maintain desired humidity. Choose humidity level between 30-70%, or "continuous. Anti-Bacterial with Ion-Exchange Filter (optional) and Air-Purifying Ionizer, which can be turned on or off. Prevents White Dust with the Ion-Exchange Filter (optional). Powerful Mist-Emitting Capacity with 3 output settings. Large Tank for long operation time without refilling (1.6 gallons). 7-Color Night-Light which can be turned on or off. Smoothly rotates between the full range of colors. Auto Shut-Off, automatically turning the humidifier off when out of water, while sounding alarm. Twelve Timer Settings. Easy to Fill. 360o Manually Rotating Head to emit mist any direction. Up to 450 Sq. Ft. in coverage area

Digital Ultrasonic HumidifierThe Germ Guardian Digital Ultrasonic HumidifierH3000 uses Silver Cleantechnology to fight the growth of mold and bacteria in the water tank.The Digital Ultrasonic Humidifier has an option for warm or cold humidification. An adjustable spray function helps regulate the volume of spray you desire. And since the humidifier is ultrasonic its virtually silent when it runs making it ideal to have on while you sleep.Digital Ultrasonic HumidifierFeature s and BenefitsProduct SpecificationsPow er Supply AC120V 60HzPower Consumption 140W 40W on cold humidification Humidity Range 25-90 Maximum humidity capacity About 350cc/hr.at highest setting and warm humidification Tank Capacity 1.4 gallons Successive Humidity Hours Up to 72 hours depending on atmospheric conditions DimensionsWidth 14.5 inchesLengthy 9 inchesHeight 12 inchesWeight 8.8 pounds not including water in tankWarranty 3-year limited warrantyFeatures and Benefits Fights Mold Silver Clean technology fights the growth of mold and bacteria in the water tank.Virtually Silent OperationUltrason ic technology is virtually silent when runningMaintenanc e-Free & No Added CostsNo evaporating pads or wicks to clean or replaceLow Water IndicationLets you know when its time to refill the water tankTemperature ControlOption for warm or cold humidification Digital Ultrasonic HumidifierFrequen tly Asked QuestionsWhat is the difference between Humidifier models H3000 and H3010?Mode H3000 displays the current humidity level. Model H3010 has a digital clock feature.Why should I use a humidifier? People need a certain level of humidity to be comfortable. In the winter indoor humidity can be extremely low and the lack of humidity can dry out your skin and mucous membranes. Low humidity also makes the air feel colder than it actually is. Dry air can also dry out the wood in the walls and floors of our houses. As the drying wood shrinks it can cause creaks in floors and cracks in drywall and plaster. Dry air also increases static electricity.Does the product require regular cleaning?Regular cleaning is recommended. When storing the unit it is recommended to pour any excess water out and clean it with a soft dampcloth. Let dry completely before storing.Are there any wicks or evaporating pads to replace?No. There areno wicks or pads to replace.What is ultrasonic technology?An ultrasonic humidifier uses a metal diaphragm vibrating at an ultrasonic frequency to create water droplets. Thanks to ultrasonic technology the Germ Guardian humidifier is virtually silent when runningallowing you to keep iton while you sleep.What is Silver Clean technology and why is it used inyour humidifier? Silver is known to kill some 650 species of bacteria or viruses simply by coming into contact with them. Silver Clean is used in the water tank to fight the growth of mold and bacteria.Where should I use the product?It is recommended that you place the product up and not on the floor. Placing it on a table or nightstand during operation is suggested.What size room will the humidifier work in?Thanks to the adjustable spray feature this humidifier works well in both large and small rooms. What is a comfortable humidity level?Forty to fifty-five percent humidity is considered within the comfortable range. Any humidity level below thirty percent is considered dry.How do I choose warm or cool humidification? Choosing warm or cool humidification is based on your preference. Warm moisture tends to make the air in the room feel warmer due to the warm vapor being released into the air. In contrast cool moisture generally has the opposite effect causing the air to feel cooler.Therefore if you live in a warm climate you may prefer a cool moisture humidifier while those who live in colder climates may prefer a warm moisture humidifier.Do I need to heat the water first if I want to have warm humidification? No. It is recommended to put room temperature water into the tank for humidifying. The Germ Guardian humid...

The Germ Guardian Ultrasonic Midsize Manual Humidifier (H1500) is a fully customizable and powerful humidifier which features Silver Clean technology to automatically fight the growth of mold and bacteria. This features promises that clean, fresh water is sent into the room. Thanks to ultrasonic technology this product is virtually silent when it runs making it ideal to have on while you sleep. The humidifier is equipped with the option for warm or cool mist and a low water indicator light lets you know when it’s time to refill the water tank. This product has an auto shut off feature and the display panel may also be turned on to act as a night light. This humidifier is ideal for rooms up to 200 square foot. No added costs: No evaporating pads, wicks or filters to replace, this unit is 100% standalone! Safe and healthy: Supports easy breathing for you, perfect for those concerned with cough cold season. Customizable: Warm or cool mist Unit features variable spray control for use in small and large rooms.

Germ Guardian Ultrasonic Digital Humidifier Unlike other humidifiers that grow slimy mold and bacteria in the water tank and send it out into the room, the Germ Guardian Ultrasonic Digital Humidifier uses Silver Clean technology to fight the growth of mold and bacteria in the water tank. Clean, fresh water is then sent into the room. It's virtually silent when it runs and uses ultrasonic technology for quiet operation while you sleep. The humidifier is equipped with the option for warm or cool humidification and a low water indicator light that lets you know when it's time to refill the water tank. Features: Fights Mold - Uses Silver Clean technology to fight the growth of mold and bacteria in the water tank so clean, fresh mist is sent into the room Warm & Cool Humidification - Option to choose from warm and cool mist No Added Costs - No evaporating pads, filters or wicks to clean or replace. Low Water Indication - Low water indication light turns on when it's time to refill the tank Silent Operation - Ultrasonic technology makes humidifier virtually silent when running Spray Control - Variable spray control for use in small and large rooms Up to 72-hour run time 1.4 gallon tank capacity

The Germ Guardian Ultrasonic Midsize Manual Humidifier (H1500) is a fully customizable and powerful humidifier which features Silver Clean technology to automatically fight the growth of mold and bacteria. This features promises that clean, fresh water is sent into the room. Thanks to ultrasonic technology this product is virtually silent when it runs making it ideal to have on while you sleep. The humidifier is equipped with the option for warm or cool mist and a low water indicator light lets you know when it’s time to refill the water tank. This product has an auto shut off feature and the display panel may also be turned on to act as a night light. This humidifier is ideal for rooms up to 200 square foot. No added costs: No evaporating pads, wicks or filters to replace, this unit is 100% standalone! Safe and healthy: Supports easy breathing for you, perfect for those concerned with cough cold season. Customizable: Warm or cool mist Unit features variable spray control for use in small and large rooms.

The Germ Guardian Digital Ultrasonic Midsize Humidifier (H1600) is a fully customizable and powerful humidifier which features Silver Clean technology to automatically fight the growth of mold and bacteria. This features promises that clean, fresh water is sent into the room. Thanks to ultrasonic technology this product is virtually silent when it runs making it ideal to have on while you sleep. The humidifier is equipped with the option for warm or cool mist and a low water indicator light lets you know when it’s time to refill the water tank. This product has an auto shut off feature and the display panel may also be turned on to act as a night light. This humidifier is ideal for rooms up to 200 square foot. No added costs: No evaporating pads, wicks or filters to replace, this unit is 100% standalone! Safe and healthy: Supports easy breathing for you, perfect for those concerned with cough cold season. Customizable: Warm or cool mist Unit features variable spray control for use in small and large rooms.

Maintain manageable conditions with this humidifier. Offering quiet, ultrasonic, filter-free operation, it provides cool visible mist, variable mist control, and auto shutoff. Suitable for medium-sized rooms, it runs for 24 hours on a full tank at the lowest setting. A built-in handle lets you easily remove and carry the 1.6 gallon tank, and the compact design fits on a nightstand. From Holmes. HUMIDIFIER HUMIDIFIERS

Ultrasonic, Cool-Mist Humidifier 2500X Anti-Bacterial with Ion-Exchange Filter (optional) and Air-Purifying Ionizer, which can be turned on or off. Prevents White Dust with the Ion-Exchange Filter (optional). Powerful Mist-Emitting Capacity with 3 output settings. Large Tank for long operation time without refilling (1.6 gallons). 7-Color Night-Light which can be turned on or off. Smoothly rotates between the full range of colors. Auto Shut-Off, automatically turning the humidifier off when out of water, while sounding alarm. Three Timer Settings. Easy to Fill. 360o Manually Rotating Head to emit mist any direction. Up to 450 Sq. Ft. in coverage area

CERAMIC TOWER HEATERS Heater with Humidifier Ceramic heaters offer one of the most popular solutions for quick heating. Portable tower heaters feature positive temperature coefficient PTC heating that improves ceramics for more efficiency with less power consumption. Tower heaters offer 7501500 watt operation with 2-heat settings. Offers ultra-quiet fan only operation. Includes overheat protection and tip-over protection for safety and long life. Heater with Humidifier features a multi-color display and allows oscillation for improved heating. Includes a built-in ultrasonic humidifier. ETL ETL-C approved. 1 year warranty. 7.60 L. 8.76 W. 25.00 H.

Help your little ones breathe easier by adding moisture to the air with our adorable Dolphin humidifier. A humidifier will help achieve the ideal conditions to sleep well at night and provides year-round relief from the drying effects of AC and Heater. Ultrasonic technology makes it noiseless and the fine atomization lasts about 8 to 10 hours. Features super-quiet operation, overflow protection and auto shut-off protection (with no audible alarm) - the perfect addition to any room. Features and Functions · Cool mist (ultrasonic technology) · High humidity output · Silent operation · Adjustable mist intensity · Auto shut-off protection (ultrasonic generator only - fan will continue to run) · 1.4 liters tank capacity · Steam emission autonomy: 8 to 10 hours · Designed for rooms up to 450 sq. ft. · No-slip feet · Adorable design · ETL Specifications Input voltage 120V / 60Hz Power consumption 21W Water tank capacity 1.4 liters Steam emission autonomy 8 to 10 hours Color Baby Blue and White Unit Dimensions (L x W x H) 14.5 x 6 x 8 in. Net weight lbs Gross weight lbs SU-1442 Kids Humidifier

Help your little ones breathe easier by adding moisture to the air with our adorable Orca humidifier. A humidifier will help achieve the ideal conditions to sleep well at night and provides year-round relief from the drying effects of AC and Heater. Ultrasonic technology makes it noiseless and the fine atomization lasts about 8 to 10 hours. Features super-quiet operation, overflow protection and auto shut-off protection (with no audible alarm) - the perfect addition to any room. Features and Functions · Cool mist (ultrasonic technology) · High humidity output · Silent operation · Adjustable mist intensity · Auto shut-off protection (ultrasonic generator only - fan will continue to run) · 1.4 liters tank capacity · Steam emission autonomy: 8 to 10 hours · Designed for rooms up to 450 sq. ft. · No-slip feet · Adorable design · ETL Specifications Input voltage 120V / 60Hz Power consumption 21W Water tank capacity 1.4 liters Steam emission autonomy 8 to 10 hours Color Black and White Unit Dimensions (L x W x H) 14.5 x 6 x 8 in. Net weight lbs Gross weight lbs SU-1441 Bedroom Humidifier

Features and Functions : No more sore throat, dry nose, lips or skin! Ultrasonic (no heat) humidity Silent operation Adjustable humidistat 1.48 quarts water tank capacity Continuous working up to 10 hrs after refill Easy Maintenance Great choice for small area or traveling Unit Dimension (inch): 9.25 x 9.25 x 6.75 Net Weight: 4 lb Warranty : One Year *** Click here to visit Humidifier Section to see more ***

The Sunpentown Penguin Ultrasonic Humidifier helps your little ones breathe easier by adding moisture to the air with our adorable Penguin-shaped humidifier. Provides year-round relief from the drying effects of AC and Heater. Features super

The Germ Guardian H2000 Ultrasonic Humidifier fights the growth of mold and bacteria in the water tank by using silver clean technology. This means nano silver particles are added to the water tank because silver is known for killing 650 different species of bacteria or viruses simply by being in contact with them. The Germ Guardian H2000 ultrasonic humidifier has an option for warm or cool humidification. The cool humidification water is maintained at 40 degrees and the warm humidification water is maintained at 80 degrees to disinfect low temperature bacteria. The adjustable spray function helps you regulate the volume of spray you desire. When the water runs out, a low water indication light turns on and the humidifier automatically turns off until refilled. The H2000 ultrasonic humidifier operates almost silently. The ultrasonic technology uses a metal diaphragm vibrating at an ultrasonic frequency to create water droplets that are expelled out into the room to help maintain the desired humidity level. The operation is quiet so you can even use the humidifier when sleeping.