To activate turn the Mini Laser Projector LED Light Show on simply plug the adapter cable into the projector. Set on Auto to have lasers move and collide. You can set the speed, have your setting blink or have the laser sync with music. Height: 4.87 in. - Width: 3.62 in. - Depth: 2.0 in. - Tripod Height: 5.75 in. - Projector Color: Blue - LED Colors: Red and Green - Batteries: Includes a two slot AC/DC adapter. Batteries are not required. - Weight: 1.00 LB