This compact front light delivers 100 lumens of light output from a small and lightweight design this tiny unit is ideal for the everyday commute 1 x cree xt e r4 high brightness led rechargeable lithium polymer battery 37v 700mah usb rechargeable water resistant headlight with durable aluminum alloy light cap 4 modes over drive 100 lumen 2 hours runtime high 50 lumens 3 hours 50 mins runtime standard 20 lumens 8 hours 25 mins runtime flashing 8 hours 20 mins runtime quick rel