From the Manufacturer:
compact diffuser is perfect for any small room. It provides an ultrasonic
mist and makes no sound.
Press #1 = Constant diffusion and color changing LED lights
Press #2 = Set a specific color
Press #3 = diffusion w/ no lights
Press #4 = OFF
This unit is very easy to fill with tap or purified water. A very
affordable solution for any home. It auto shuts off when empty. Runs
constantly for 3-4 hours.