This is a multi function machine that acts as a clock, alarm clock, sound machine, subtle nighttime lighting and essential oil diffuser all in one. It was easy to set up and operate. It plugs into the wall but has a battery backup as well. The lights can be set to one color or they can change. My toddlers were rather fascinated by this. I am happy to have this on my nightstand as I was using my cell phone to tell the time. Very sleek looking machine.