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Name: Bicycle Valve Light Material: Plastic Race Speed: 10km/Hour Length: 6.25cm Usage: wheel LED Light Setup: simply screw on your tire valve stem Valve Cap: American Standard / European Standard Supported Circuit: Independent Circuit Design, Light control circuit, sensor circuit, LED circuit Power by: 3*AG10cell batteries (include) 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. We have full (60 DAY WARRANTY) on all products. We are happy to send out any replacements you may need. Best regards, New Tech Junkies-NTJ There are no instructions provided. So...... Here are some tips: 1. You need to unscrew them to expose the batteries, where you will find a piece of paper protecting the contact to prevent activation during shipping. 2. The unit comes with an adapter to allow a person to screw it to a U.S. standard valve stem size. 3. You must screw the plastic unit together to activate the light. A good thing, so you can lightly unscrew the unit when in storage. 4. The unit sticks out beyond the rim due to the 1/2-inch adapter mentioned in #2. A good thing for added visibility. A bad thing for chance of damage. 5. Shipping was timely (3 weeks faster than advertised). Less than a week. 6. Packaging was very protective (Bubble-Wrap Lined Envelope)