Ultrasonic Cool Mist Humidifier - Premium Humidifying Unit with Whisper-quiet Operation, Automatic Shut-off, and Night Light Function (Pink) Ultrasonic cool mist technology safely moisturizes the air for up to 10 hours of continuous operation so you can breathe easy and get more restful sleep 300ml tank capacity provides ideal coverage for bedrooms, offices, and other medium-sized rooms 360-degree mist nozzle make it easy to adjust mist direction to fit your comfort level Automatic shut-off safely turns humidifier off when water level is low Just plug into any USB power source, fill up a glass or bottle with water, insert the humidifier