Review: Garmin Varia RTL515 – 8/10 – Reliable alert system for being overtaken, with a very good rear light road.cc
I tried using Garmin's rear view radar for bicycles 'Varia R TL515' that can detect the approach of a car with a millimeter wave radar and can also be a tail light -
Review: Garmin Varia RTL515 Radar - Tempo
Garmin Varia RTL515 and RVR315 Cycling Radar In-Depth Review | DC Rainmaker