Features: Installs on standard tire air stem valve of cars, motocycles or bicycles. Chrome body with Ultra Bright, Long life-span LED Lamp. Universal fitment and easy to install no special wires, can be easily installed and removed. Increase nighttime and bad weather visibility. Notice: Please take the transparent plastic out for using at the 1st time. Specification Device Type:Bike Tire Led Lights Light Material : ABS fireproof materials Material:Lightweight Alloy Power Supply: 3*AG10 Button Batteries(included) Attention: 1. please make sure the positive and negative poles when installing, the end with no word facing the spring 2.Be sure to put the battery in the black insulating case inside, do not expose it, otherwise the battery and the metal of the lamp will cause the short circuit ,the battery will be dead in a few minutes. 3: Be careful when screwing the lamp head. Make sure that the metal strip on the side of the lamp head is in good contact with the metal base (if the metal is too close to the inside, you can manually pull it out, but must be gentle) 4: If the lamp does not light under normal conditions, you can adjust the length of the spring to ensure full contact with the battery (not too hard, it is easy to cause the spring to fall off), if it still do not light up please change the battery to try.