Know what's comingRide with extra confidence with the Trek CarBack Radar Rear Light. The CarBack's radar helps detect rear-approaching vehicles from up to 240 m and provides audio and visual alerts through paired GPS head units for increased on-bike awareness.Built with integrated best-in-class Daytime Running Lights that are visible from up to 2 km away, the CarBack is a must-have for every cyclist riding on shared roads.Product detailsCarBack can detect and alert riders of rear-approaching vehicles from up to 240 m awayCompatible with most cycling GPS computersPair CarBack with the Trek Accessory app to see a vehicle's rear-approaching and passing distance on your smartphoneDesigned with focus, flash and range to be daytime-visible from up to 2 km awayFour light-flash modes: Day Flash 90LM, Day Steady 25LM, Night Steady 5LM and Night Flash 5 LMVisible fuel gauge LEDs make it easy to see the CarBack's 7+ hour battery statusIPX7 waterproof rating to confidently ride through wet conditi