LED Color Bicycle, Motorcycle, or Car safety Lights - Waterproof, Motion-sensitive Wheel Light (Yellow) Includes 2 LED Valve Lights No on/off Switch; light activates when wheels spin Batteries are Included: 3 x AG10 Button Batteries Please Note: must take out the tiny piece of paper so batteries will work. Place light on Valve stem with furnished adapter (if required). Lights will illuminate when in motion.