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I'm coming from the Magicshine SeeMe R300 and while I did love that radar/light, the 820 is definitely an upgrade.
I appreciate the multi-lane functionality that shows you where cars are in relation to you, and being able to detect vehicle sizes (as well as detecting vehicles going the same speed as you) is actually one of the primary reasons I bought this model. I was hoping for something that could not only show me car traffic but also other cyclists. This works well, I can now also see the relative position of my partner as she rides behind me, and I can see when she drops back a bit too far and I need to ease up until she's back on my screen.
The R300 had some trouble with ghosting, occasionally reporting cars that weren't there or maybe briefly mistaking a mailbox for a car or something like that, but I have yet to notice a single mistake with the 820. That's not to say that it doesn't happen, it's just rare enough that I have yet to see it. It seems (though I have to give it another run to test to be sure) that the detection range of bicycles behind you might be shorter than with cars, because the one time I tested with my partner it seemed like it dropped her and brought her back more often than expected. Really not a huge deal, but I'm really digging deep to find something critical to say.
Battery life seems great, I haven't run it long enough to see it run out of juice because it's basically automatic to pull it off along with the Edge 1050 to charge them after a ride. It is nice to know that if I forget once or twice, it will still be ready with plenty of charge.
The install mount is pretty simple, you can mount it to your seatpost with options for round or not-round posts. It would be nice to find a mount somewhere that supports mounting to the back of a rack so that I can put it on my commuter bike when I'm using that, because the bag on the rack gets in the way of anything mounted to the seat post.
The light itself is very bright and there are a few different brightness/flashing options, as well as a braking indicator which my partner has reported works just fine. The Varia app is pretty nice and acts as another display that's bigger than what I have on the Edge 1050. I have a mount for my phone and normally I don't use the phone for much since all of the data is on the Edge 1050, but I suppose I could have the Varia app running on the phone and turn off the radar display on the 1050 so that I can see everything full time without the radar display sometimes hiding the Edge data. I don't know, it might be too much to have to think about my phone too, I like having the one display and the phone mount is just a place to put my locked phone so I don't have to have it in a pocket.
Frequently bought together
This item: Garmin Varia™ RearVue 820, Advanced Rearview Radar & Tail Light, Enhanced Visibility & Awareness for Cyclists, Advanced Vehicle Tracking & Brake Light, Up to 24 Hrs of Battery Life in Day Flash Mode
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Customers say
Customers praise the bicycle light's radar performance, with one noting it consistently detects vehicles beyond its range, and they appreciate its battery life, with one highlighting the replaceable battery feature. Moreover, the technology receives positive feedback, with one customer noting it's an improvement over the previous 515 unit, and customers like its brightness, with one mentioning its powerful daytime flashing options. However, the functionality receives mixed reviews, with some saying it works well while others report issues.
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9 customers mention radar performance, 7 positive, 2 negative
...This works well, I can now also see the relative position of my partner as she rides behind me, and I can see when she drops back a bit too far and...Read more
...Haven't had any false positives or missed vehicles. An improvement over the previous 515 unit. Doesn't always get the type of vehicle correct.Read more
...like the brighter light and the fact that the radar detects a little further back. Seeing the shapes of the vehicles...Read more
...unless you are the last cyclist in the group, the radar will always show a vehicle approaching....Read more
7 customers mention battery life, 6 positive, 1 negative
...1. Battery life. My previous Varia wouldn't last six hours without complaining that it needed a charge. 2....Read more
...Battery life seems great, I haven't run it long enough to see it run out of juice because it's basically automatic to pull it off along with the...Read more
...Rearward eyes on a bike ride Replaceable Battery is a HUGE PlusRead more
I like the fact that battery seems to last longer. It also has a longer range and it is wider....Read more
7 customers mention technology, 7 positive, 0 negative
Excellent product - advancing the state of the art in bike radar....Read more
...Haven't had any false positives or missed vehicles. An improvement over the previous 515 unit. Doesn't always get the type of vehicle correct.Read more
Makes for a very nice, informative and detailed display on my Garmin Edge 840. Multiple lanes are shown....Read more
...1. Cost. At $300 it's about double what my previous Varia cost. Great stuff, but you might want to wait for the price to drop, or shop a sale, or...Read more
5 customers mention brightness, 5 positive, 0 negative
...The price.....I personally find it's worth it. Extra battery life, brighter light, further radar, and an updated companion app are worth the +$100...Read more
...The light itself is very bright and there are a few different brightness/flashing options, as well as a braking indicator which my partner has...Read more
...2. Bright flash that gets brighter when a car comes from behind. 3....Read more
...I haven't had the chance to fully test battery life. The daytime flashing is very powerful....Read more
6 customers mention functionality, 4 positive, 2 negative
Started off great until I did the firmware update. Bricked it swiftly....Read more
...This is where this new unit, the 820 is useless....Read more
...The Varia 820 works fine when you are not riding in a group. If you do and there is a cyclist behind you, the unit will indicate a threat....Read more
...This works well, I can now also see the relative position of my partner as she rides behind me, and I can see when she drops back a bit too far and...Read more
Top reviews from the United States
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- Reviewed in the United States on February 21, 2026
- Reviewed in the United States on March 19, 2026
Top reviews from other countries
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Paolo negriReviewed in Italy on April 6, 2026
Radar ottimo luce posteriore si vede da molto lontano batteria durevole
