2025-08-26 00:00:00 The Trek Accessories App adds additional functionality to the Trek CarBack Radar Rear Bike Light by giving cyclists advanced alerts and a real-time visual depiction of rear approaching detected vehicles. Helps you see cars. Use the Trek Accessories App to receive visual and audible alerts of detected rear approaching vehicles. The Trek Accessories App and Trek CarBack Radar can detect rear approaching vehicles from up to 240M, with vehicles first appearing with an audible beep and a visual indicator at the bottom of the App screen. Once the detected vehicle approaches to within 150M, the vehicle is shown on screen in real time. Once within 75M the Vehicles location is depicted in both distance behind and distance to either side, indicating preparation for a potential pass. Once the vehicle completes a pass, an audible alert indicates the pass and the vehicle drops off the screen.