Really Cool Light- USB Charging or Battery Powered Romantic Room Rotation Star Projector Lights Lamp Sky Diascope Home Decro for Kids(attention the Size) (Blue) Rotates at 360-degree degree, provides a fantastic moving starry sky. Size: 3.35" x 4" (Dia. x H) Power supply: USB Power or 4*AAA batteries (not included) Easy operation.Ideal for romantic lovers and families with kids. Arouse kids' interest of the universe in an easy way.