2 high power LEDs combined with Opticube lens technology. Extremely durable die-cast aluminum body, LED lifetime up to 100,000 hours. 12V, 2,700mAh NiMH battery in a neoprene bag for multiple mounting options. LED efficiency provides up to 5 hours of run time from compact battery. Universal intelligent smart charger with 3-hour charge time. Noise-free: compatible with CatEye wireless. computers and HRMs. Comes standard with both helmet and hendlebar mounts.Extensions for storing batter in jersey pocket or hydration pack. Light weith - only 645 grams.