The RTL515 pairs a bright tail light with a rearview radar that tracks vehicles up to 153 yards behind you, then alerts you, audibly through a paired head unit or visually on a compatible Garmin bike computer, before they reach you. It mounts on the seatpost, runs for hours between charges, and works with Garmin's cycling ecosystem rather than trying to replace it. For road and gravel riders who keep getting buzzed by cars that seem to appear out of nowhere, it turns a guess into a warning. Buy it if you ride roads where traffic matters; skip it if you never share space with cars.
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