Extremely Bright: 1600 Lumen CREE T6 LED Technology. This Bike Light with new 6,400mAh battery gets Approximately 4+ Hours on High, 6+ hours on medium, 16+ hours on Low External Rechargeable Battery: Incredible 6,400mAh battery encased durable rubber shell. Allows for super bright lighting throughout the longest rides. Ultimate Safety: More features than any look-alike. Strobe for daytime riding clears cars from your path. Best Bike Light Set: Use for cycling, mountain biking, MX, etc. Helmet mounting accessories included Proudly USA-Based: Unlike our competition, we are proud to be a USA-based company, committed to delivering quality and reliable products while providing excellent support to our customers across the nation. BRIGHT EYES Helios Fully Waterproof 1600 lumen Rechargeable Mountain, Road Bike, MX Headlight, 6400mAh External Battery (NOW 4+ HOURS on Bright Beam) - INCLUDED: Free Diffuser Lens and Free Taillight. External Rechargeable Battery: Incredible 6,400mAh battery encased durable rubber shell. Allows for super bright lighting throughout the longest rides.