Stay safer while on the road by adding the Garmin Varia RTL515 rearview radar with taillight to your bicycle. This smart little device pairs to your Edge bike computer or your compatible smartphone and can alert you to any traffic coming from behind from as far away as 140 meters (153 yards). The taillight ensures you are visible to drivers for up to 16 hours in flash mode. | Garmin Varia RTL515 Rearview Radar with Tail Light