Exposure Lights Tracer Taillight Cable Free Design (CFD): A primary feature unique to Exposure Lights removes the hassle of cables and straps Optimized Mode Selector : The Optimized Mode Selector allows you to easily select from a concise number of programs for your ride Fuel Gauge: 3 color Fuel Gauge indicator in lens as light is switched off Weight: 39g Output: 75 lumens red light Power: 700mAh Burn time: 3 - 24 hours Emitter: 1 x Cree XPG red LED