Installed in the center of the wheel, won't affect the center of gravity of the bicycle

Features:
No speed is required, will constant lighting when power on.
Separate design, easier to install, and suitable for mountain bikes and children's balance cars. 
Waterproof design, you can usually ride in rainy days.
Used to install children's bike wheel hubs for safe driving at night.
Easy to install and remove. Automatically color changing.

Specifications:
Diameter not exceeding 30mm is available
Material: PC
Battery Capacity: 300mAh Li-Battery (USB rechargeable)
Installed Diameter: Less than 30mm (Especially recommend for kids balance bike)
Work Time: 8-12 hours
Item size: 82 * 82mm / 3.2 * 3.2in
Package size: 86 * 86 * 37mm / 3.4 * 3.4 * 1.5in
Package weight: 70g / 2.5ounce

Packing List:
1 * Bicycle Wheel Light
1 * Set of Rubber Gasket
1 * USB Charging Cable
 

Shipping:

1.We guarantee to ship goods out within 24-72 hour after