Collect & Chase C&C (4PACK) LED Valve Bike Lights Flashing Motion Activated Easy Screw Install with 3 Batteries Included in Each Light + Free Bonus Backup Light Motion activated and flashing (auto shut off when not moving) Fits standard USA bike & car valve stems Comes with free bonus gift backup light All lights come with 3 batteries inside Please unscrew & remove all plastic inserts before installing