Features: 1. Double sense (sensitive Vibration and Light) 2. Led Flash English letters and automatically change; 3. 100% Waterproof, Do not worry about the led light will be damaged when it rains or car wash. 4. Now on the market are single-sided, and can only see one side. And our latest product is the double of this. When you ride, the way people can see words on both sides 5. Power: 3 AG10 button batteries, included in this product is included 6. Fit Valve (American And British Air Nozzle)
Specifications: 1. Dimensions: 7.4x1.6 cm /2.91x0.63 inch 2. Weight: 30G