The Exposure Sirius MK10/TraceR MK2 REAKT Light Set consists of a 900-lumen Sirius front light paired with the smart TraceR ReAKT rear light, giving you the best and most compact front and rear light combo. See down the road ahead in the darkest of nights and be seen from behind on even the brightest of days. This superb combination ensures you stay visible with 240° visibility and the bespoke daytime running pulse mode: DayBright. Day and night, rural or urban, the Sirius TraceR pack has got you covered!Smart Port+Smart Port+ enables the charge port to accept auxiliary accessories such as rear lights, remote switches, Support Cells and use your light as a power bank to charge USB devices ... More info