Improve Riding Safety: It can improve the visibility in all directions at night or in bad weather, making you safer; 

Waterproof & Durable: IP55 waterproof, never worry about rainy and snowy weather;

Easy to Install: No tools required, it only takes a few seconds to install or remove; Suitable for American valve (Schrader Valve) and French valve (Presta Valve); It will emit a charming halo with the rotation of the wheel;

Automatic Switch: it will automatically turn off when you stop riding or during the day;
(Note: Please unscrew the lamp before use, and put the battery in the order of positive and negative.)

SPECS
Material: PC+Zinc Alloy
Induction Switch: Light and vibration control
Endurance: 15hours
Waterproof: IP55
Battery: AG13 button battery