PowerDecals are innovative LED-backlit logos for your vehicle window. They turn on automatically while you're driving at night and shut off after one minute when you're parked. Once they're installed they shine through factory tinted windows and never need to be touched. Easy installation with quality 3M adhesion material, just peel and stick, no tools required. LED-backlit crown with 4-inch diameter, comes with 3 AA batteries, window clips and cleaning cloth.