100 lumens of rear led powersingle led generates a wide beam with a flat top designed to be seen not dazzle35 hour run time on maximum powerthis light will illuminate the road red just behind the bikepush button waterproof switch easy to operate even with winter glovesrobust water proof design perfect for those wet winter nightsgopro compatible bracket will even fit aero posts thanks to it39s unique designmicro usb lead included