Cool mist humidifiers create a soothing atmosphere in your home. According to the Mayo Clinic, indoor humidity 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. The Ultrasonic Personal Humidifier from Lasko provides quiet, soothing humidity for your room. The compact size means it is perfect for adding moisture to the air in your home office or while you travel. It comes with a USB cable, so it's easy to plug it in to a laptop or standard USB plug adapter. The cool mist nozzles feature 4 mist control settings: both nozzles mist, alternating nozzles mist, right nozzle only, and left nozzle only. 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.