The TaoTronics TT-AH001 home humidifier is an ultrasonic humidifier that emits water vapor to moisten dry air. It uses a microporous ceramic cartridge that filters water from micro-organisms and bad odor. (Please do not use any essential oil or similar chemical perfume with this product.) the humidity level can easily be set to the ideal setting for your room. You can also adjust the mist modes and use the 360 degree nozzle to adjust the mist angle so it's right for you. As an ultrasonic humidifier, it's incredibly quiet and doesn't make a sound, which is perfect to use when going to sleep. Over 1 gallon capacity and 15 hour working time on a full tank will last most of the day and well into the night. The LED display provides information including the humidity level and other modes you are using. Sleep mode turns off the LED at night so it doesn't disturb your sleep. Two handles on the top and the bottom of the unit make it convenient to replenish the water. Finally the timer sets the humidity for a set period before switching the humidifier off.