***note: no high speed use or could tear valve stem. Please obey all traffic laws and regulations. Our warranty covers only bike lights. Name: Bicycle Valve Light Material: Plastic/metal Race Speed: 10km/Hour Length: 6.25cm Usage: wheel LED Light Setup: simply screw on your tire valve stem Valve Cap: American Standard Circuit: Independent Circuit Design, Light control circuit, sensor circuit, LED circuit Power by: 3*AG10cell batteries (include) BIKE LIGHTS. Please (REMOVE ALL INTERNAL PLASTIC) before use. These lights are (MOTION ACTIVATED ONLY). The batteries must (FACE PROPER DIRECTION). Please (DO NOT OVER TIGHTEN). There is a motion sensor inside and you must only tighten at the appropriate amount. Let me know if any of that helps. We have full (60 DAY WARRANTY) on all products.