Rear view radar
"Works as expected. Maybe should have spent more to have video."
The Garmin Varia Rearview Radar RTL515 pairs up with your Garmin Edge bike computer to alert you to approaching vehicles from the rear. The sensor has a 140-metre range and its rear light can be seen from up to 1 mile away.
Garmin Device and Smartphone Compatible Cycling Radar and Tail Light
In addition to being compatible with your Edge computer, the Varia radar device can also pair up with your smartphone. The Garmin Varia smartphone app provides sound and vibration alerts, plus bold graphics to inform you of the speed and position of any vehicles that are approaching.
Bike Safety Radar and Rear Light with Long Battery Life
With its compact, vertically mounted shape, the Varia mounts easily on the seatpost of most bikes. It also has a long battery life, lasting up to 7 hours between charges.
Additional Specifications:
Garmin
Product ID: GM052020-14
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Overall rating: 4.0 / 5 from 2 reviews.
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"Works as expected. Maybe should have spent more to have video."
— Paul B. (4/5)
"I have only used this Garmin radar on a couple of rides for a total of 100 miles in a mix of city, suburban, and rural roads. The device is super accurate (even when I doubted it because I could not see the car behind me (too far). The app works fine but is kind of a "nothing" app. It just does one thing...display the bike and cars coming behind. But it would be great (and my suggestion for one major improvement) would be to integrate the radar display functions into Strava app for phone so I can see other information alongside the cars coming up. Having said that, now that I have tried it, I will not ride without it."
— Naveed B. (4/5)