USB humidifier with Car Plug adapter, very simple design, USB-340Mini USB Air Humidifier with Car Plug Adapter Imported Ultrasonic chips, will not WET your desk even during Long-time Mist Outputing. Rated voltage: 5VDCRated power: 2.0 W Mist Out volume: 40mlCup Capacity: 240ml Ultrasonic Technology, Micro-Holes Mist TechonogyApplicable place: rooms(bedroom, living room, yoga room), hotels, ...