3 ways to power: Power it with a USB port into a wall adapter and into the wall (Adapter not include).Power it with a USB plug to computer.Power it with 4 AA batteries (not included).Cute design and romantic atmosphere:There are a lot of different options for colors and amount of star projected. It can be used in non-projection mode by putting the cover on or it can be used to project the stars onto the ceiling and walls.Multifunction: Ideal for decorating wedding、 birthday、 parties. Great for romantic night lamp and decoration light use.