Product description:

Function: constant lighting, flash; 7 colors flash alternately; 18 modes display automatically

Work time: 8-12 hours

Mounting placement: wheel hubs

Waterproof rating：Life waterproof

No speed is required, will constant lighting when power on Installed in the center of the wheel, won't affect the center of gravity of the bicycle

Installed diameter: less than 30mm, especially recommend for kids balance bike

Battery: 300mAh Li Battery