This small ultrasonic personal humidifier from Lasko provides quiet soothing humidity for your room. Indoor humidity maintained between 30% to 50% is ideal and can help soothe dry air problems of the skin throat and sinuses. Additionally proper humidity levels can create an atmosphere for improved sleep and reduce static electricity from dry air which is especially beneficial for dry hotel air and other travel. The compact size means it is perfect for adding cool mist to the air in your home office or while you travel. It comes with a USB cable so its easy to plug it in to a laptop or standard USB plug adapter. This unit features 4 different mist outputs: right nozzle only left nozzle only both nozzles mist and alternating nozzles mist. The easy-fill tank holds 400 ml of water and features a convenient top fill design and the humidifier will automatically shut off when the tank is empty. The simple one button control allows you to adjust mist level and the multi-color LED nightlight. Regular maintenance is a breeze because there are no filters to replace. Comes fully assembled.