The TR70 pairs a rear-facing radar with an 80-lumen brake light: it detects approaching vehicles up to 140 metres back, tracks multiple targets at once and pushes the warning to a compatible bike computer so you are never surprised by an overtake. The light brightens automatically on braking. Battery life runs to roughly 40 hours in low mode, it is IPX7 rated for rain, and the mount system swaps between D-shaped and aero seatposts. It is the same idea as the Garmin Varia at a fraction of the price.
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