Exposure Lights takes the guesswork out of choosing a lighting system for your bike with its Sirius Mk4 Headlight with TraceR Tail Light Set. Whether you commute regularly through dense traffic or choose to log your training miles on lonely stretches of roads in the early mornings and late evenings, having both a head and tail light is essential. Up front, the Sirius Mk4's 500 lumens will allow you to anticipate obstacles on dark roads rather than just react to them. The rear TraceR's 75 lumens help draw attention to you on the road, providing wide angle illumination without blinding other road users approaching from behind. We've seen other high end light manufacturers constructing their lights with built in USB charging capabilities, eliminating the need to constantly replace batteries. Exposure does this with all of its lights, making quick recharging between rides easy. Each light also has a fuel gauge so you can keep an eye on your battery life when you're out riding, and both have Exposure Lights' built in Optimal Mode Selector to help choose a mode based on how much battery life you have left. Together, the lights will only add around a claimed 115g to your frame. Both lights come with a sturdy, QR mount to attach to the handlebar and seatpost.