The PowerDecal is a brand new, patent pending line of sports related car window decals. Innovative PowerDecals automatically illuminate at dusk, proudly promoting your team allegiance! A built in photo optic sensor detects when it's dark and automatically turns on the LED luminescent panel. An internal motion detector automatically turns off the LEDs after the vehicle has been motionless for a few minutes! The decals attach to the inside of a vehicle's window using 3M adhesive clips. Includes 3 AAA batteries as well as 2 sets of window mounting clips.