Garmin's Varia RVR315 Rearview Radar detects traffic from up to 140 meters behind your bicycle. This seatpost-mounted indicator connects to Garmin's Edge Computer, and you can connect it to your smartphone via the Varia app to increase your awareness with vibration alerts, sound tones, and even graphics. The device is also third-party compatible so you can connect it with GPS apps to map the radar's alerts. Garmin packed the compact radar with a 7hr battery, and it's small enough to mount to most seatposts.
Smart radar alerts approaching vehicles behind your bicycle
Built-in radar covers 140 meters
Pairs with Garmin's Edge Computer or a smartphone's Varia App
Battery life lasts up to 7 hours
Compact designe mounts to the seatpots of almost any road-use bike