Slim aerodynamic front light with a maximum 110 lumens perfect for road and commuter cycling features rubber strap allows tool free mounting and removal low battery indicator 76x34x31cm 42g lamp 3 super bright leds battery 37v 640 mah lithium modes high beam low beam blinking pulse burn time approx 2hr high 4hr low 15hr blinking 50hr pulse charge time approx 2hrs