This USB-powered humidifier can go anywhere! A small, portable design is perfect for travel, hotels, bedrooms or home office. Runs on included USB cord. Choose from two mist modes: continuous or intermittent mist. The water tank holds 150 ml of water. The window in the water reservoir lets you see when water is low. Built-in water sensor automatically turns off power when water falls below adequate supply. Leak-proof design. Colorful light rotates through 7 different colors when on. Optional on/off.