raydrop Ultrasonic Cool Mist Humidifier,Room Humidifier with Whisper-quiet Operation, Automatic Shut-off, and Night Light Function ULTRASONIC COOL MIST TECHNOLOGY  It improved the moisture of the bedroom, office, and any other medium-sized rooms to help you breathe more comfortable with great efficiency. EASILY CONTROL  you can control the mist from low state to high one by knob and the humidifier offer the aroma oil box which behind the main body for you to drop something you like. 2.8-LITER TANK CAPACITY  Full 8 hours of continuous operation is available for the unit. OPTIONAL LED LIGHTING  7 color LED night light can make people relaxed and it can be turn off without shutting down the humidifier. SAFETY LOW-WATER PROTECTION  The smart cool mist humidifier will automatically shut down when the water in it run out or have reached a critically low state, turning on the red light.