5.Quality Materials Warm GiftsSmartDevil Desktop Humidifier is made from the finest durable ABS material to provide long-lasting usability. It is designed to perfectly match every occasion. A great gift for men or women on important days such as birthdays, holidays and housewarming. 4.Two Spray ModesThis cool mist humidifier contains two spray modes: continuous spray intermittent spray. First single press mist button to start the continuous mist mode Second press mist button to switch to intermittent mode. The duration of the spray can last up to 12 hours and the intermittent spray can last up to 18 hours. 3.Waterless Auto-Off Powered by USBThe humidifiers will automatically shut off when water runs out. This USB humidifier is powered by USB cable(interface of computer, laptop, adapter, power bank). No AC Adapter in box, one USB cable is included. 2.Large Capacity Large SprayThe liquid water is atomized into micron-sized water particles by ultrasonic vibration. The large volume of 500ml and the fine spray are used to increase the air humidity. It is a good companion for air-conditioned rooms. 1.Whisper Quiet Night Light FunctionSilence operation below 30dB allows you to sleep easily in a comfortable and quiet environment. There are two modes of night light function, constant light mode breathing light mode(Long press the button to control).