Neither battery nor friction required: no influence to the bicycle and riding.
Self-powered: making use of the rotating wheels and Electromagnetic induction.
Super long life span: can be used for 3000 hours.
Silicone rubber band for mounting: sturdy and protective.
Waterproof: works well in a heavy rain.
Working Time: Approx. 3000 hours
Item Size: Approx. 6.3 * 4 * 2.3cm / 2.5 * 1.6 * 0.9in
Item Weight: Approx. 30g / 1.1oz
Package Size: Approx. 12 * 10 * 3cm / 4.7 * 3.9 * 1.2in
Package Weight: Approx. 69g / 2.4oz
1 * Rear Light
1 * Magnet
1 * Silicone Rubber Band
1 * User Manual