ATWFS 1 Gallon Air Ultrasonic Mist Humidifier with 2 Fully Rotating Nozzle Spray, Mist Adjustment Mode (Blue) 360output nozzle with double spray for control of the direction of the mist and more air moisture Automatically shuts-off the humidifier when water level is low or the water tank is removed 1 gallon tank capacity provides rich air moisture for bedrooms, offices, and other medium-sized rooms Easily adjust the vapor flow and humidity level with the control knob.There is a light which can change colors when working, it can't be turned off individually unless the humidifier stops working Quiet operation(&lt;36db) for cozy breathing and a good night's sleep