Lezyne's Power Drive 1100i is a high-performance, multi-purpose LED cycling light. Compact, durable and heat-dissipating machined aluminum body. Compatible with the portable Infinite Light Power Pack, which can double the battery runtime. Two market-leading, ultra-high-output LEDs delivering up to 1100 lumens. Optimized Constant Lumens system maintains steady lumen output throughout battery cycle. Optional Overdrive Race Mode toggles between Overdrive and Economy modes only. Mode Memory function returns to selected mode after turning off. Enhanced MOR (Maximum Optical Reflection) lens with built-in side visibility. Versatile strap securely mounts to all standard bar shapes, including aero bars. Advanced Li-Ion battery for superior run time.