The Bontrager Flare RT2 Rear Light’s 90 lumens output, can be seen from upto 2km away out on the road. The compact design, is entirely waterproof with its USB seals to prevent water getting in. It features an integrated light sensor, where the light will auto adjust to the brightness surrounding you. Altogether, it has 5 modes which can all be controlled, monitored and connected to your Garmin and Bontrager ANT+ devices. A great compact light to have so your safe on the road, commuting or just out for fun.