I tried using Garmin's bicycle rear view radar ``Varia RTL 515'' which can detect the approach of a car with a millimeter wave radar and also becomes a tail light - GIGAZINE
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Garmin Varia RTL515 Rearview Radar with Tail Light for Cyclists at Lowes.com
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Metal Taillight Bracket Mount Holder For Garmin Varia Rearview Radar RTL515/510 | eBay
Amazon.com: Garmin Varia RTL515, Cycling Rearview Radar with Tail Light, Visual and Audible Alerts for Vehicles Up to 153 Yards Away, 010-02376-00, One Size : Electronics
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