Sirius 2000 Lumens Rechargeable LED Bike Front Light , HeadLamp with Waterproof Battery Pack Super Bright: 2000 Lumens with long life (&gt;100,000 hrs) 2x CREE XM-L T6 LED making sure you can see in the dark and be seen Long Run Time: External Rechargeable 4400 mAh battery with long run time (2.5-5 hours depending on the light modes) Waterproof: Both light and battery pack are waterproof (beware: NOT all batteries are waterproof, dont find out this when you are riding at night and in the rain) More Control: 4 modes (High / Medium / Low / Strobe) Warranty: 2 year warranty on light, 1 year on battery. 30 days money back gurrantee