1. Double sense (sensitive Vibration and Light)
2. Led Flash 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
6. Fit Valve (American And British Air Nozzle)
1. Dimensions: 7.4x1.6 cm /2.91x0.63 inch
2. Weight: 30G