Tyre Tire Valve Stem Caps Neon Light Cover Bicycle Motorcycle LED Material: ABS & Aluminum Color: Green, Blue, Red, White Light source: LED Total length:36mm Usage: 1.Install in 3 AG10 1.5v batteries 2.Screw down onto tyre valve 3.If the brightness of lamp is weak or low,pls change batteries Features: It's stay on (not Blinking, not flashing),very bright, CE approval The valve caps will be lighted when your car is moving,when you stop driving ,the buil-in sensors will stop the lights automatically Easy to install,just simply taking off the old valve and replace it on your car Automatically turn off when the wheels stoped 10 seconds Fitment: Fit any car / motorcycle / bicycle / truck with the Standard American valve (Air nozzle) Package includes: 2 x LED Tyre Valve Caps, 6 x batteries