Garmin's rearview bike radar review: Eyes for the back of your head - CNET
Varia Rearview Radar RVR315 - Varia RDU Device Overview
Amazon.com: TAKEWELL Bicycle Saddle Seat-Post Mount for Garmin Varia RTL515,Garmin Varia RVR315, Aluminum Alloy Mount Holder for Bicycle Saddle/Seat Bow : Electronics
Horizontal Mount Arm Kit (SL) for Garmin Varia RVR315 (includes tether – Bup Labs