Garmin Varia RTL 516 - STVZO approved rear light with radar technology for detecting approaching vehicles from up to 140 m, display/warning on Garmin wheel computers/watches/via app, 16 hour battery : Amazon.de:
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Amazon.com: Garmin 010-02376-00 Varia RTL515, Cycling Rearview Radar with Tail Light, Visual and Audible Alerts for Vehicles Up to 153 Yards Away : Electronics