The powerful and ultra-compact bike light Acebeam BK10, contains 4*XHP35 HI LEDs, and produces a maximum output up to 4000 lumens. Acebeam BK10 is powered by a 4*18650 rechargeable battery pack with over-discharge, overcharge and overheat protection to ensure safety operation. The featured exclusive Dual Distance Beam System assists with an upward beam reflection in front of the bike, makes the BK10 with 100 meters long range illumination. The rechargeable bike light Acebeam BK10 is prepared well for your outdoor cycling adventure.