Tips: Please install and test the light on night or in dark place. Because of the Photosensitivity. LED BIKE/CAR/MOTOR TIRE WHEEL LIGHTS SPECIFICATION: Material: ABS materials Power Supply: 3 x AG10 Button Batteries(included) FEATURES: New look, coolest, the colorful lights can attract the attention of so many onlookers. These LED bike wheel lights are fit for the standard tire(British valve/American valve) air stem valve of bicycles, motorcycles and cars. It can't use for a French valve. Increase visibility and safety at nighttime and in bad weather. Waterproof and Energy-efficient, lights turn on when moving and off when stopped. Operates on 3 AG10 Button cell batteries (Included). Easy to be installed and removed. PACKAGE INCLUDING: 4 x Green LED Bike/Car/Motor/Bicycle Wheel Tire Valve Light 10 x Extra AG10 Button Batteries PLEASE ATTENTION: 1. Please take the piece of paper out for using at the 1st time. 2. Sometimes it still not work when you remove the paper, then you need to put them on the valve stem and ride, they will light up. 3. Please put in the batteries in accordance with the anode and cathode. 4. Ensure full contact with the battery, if it still does not light up please change the battery to try.