About Garmin Varia Rearvue 820 Rear Light & Radar
Varia RearVue 820 is the rear view radar and tail light that alerts you to approaching vehicles on your compatible Edge cycling computer, Garmin smartwatch or Varia app on your smartphone. With our most powerful and precise radar tracking technology, it detects vehicle size and threat level with a wider field of view. The tail light provides enhanced visibility and features a brake light flash pattern when you're slowing down or stopping.

Features
Reliable rearview radar with our most powerful and precise radar tracking technology detects vehicles approaching from behind and gives audible and visual alerts on your compatible Edge cycling computer, Garmin smartwatch or on the Varia app on your smartphone.

A bright tail light provides visibility from up to 2 km (1.24 miles) away to help you be more visible to motorists approaching from behind.

Get up to 24 hours of battery life in day flash mode and up to 30 hours in radar-only mode.

See visual alerts for small, medium and large vehicles approaching, and see the movement of a vehicle and its threat level - when riding with your compatible Edge cycling computer or the Varia app on your smartphone.

Show other cyclists or motorists that you're slowing or stopping with a brake light that displays a unique flash pattern.

Same-speed tracking means you can continue to stay alert to vehicles that are following behind at the same speed or attempting to pass (tracking may be unavailable at slower speeds or when radar is obstructed).

Connect the Varia RearVue 820 rearview radar and tail light to the Varia app on your smartphone, select Garmin smartwatches or compatible Edge cycling computers for visual and audible alerts while you ride.

Ride with four different light patterns: day flash, night flash, solid mode and peloton mode; when riding with others, peloton mode preserves the eyes of others riding behind with a lower intensity flash; also, create your own custom light patterns in the Varia app on your smartphone.

Mounts onto your seat post and is compatible with the Varia seat rail mount kit (sold separately).

Specifications
Dimensions (LxWxD): 98.9 x 25.9 x 43.2 mm (3.9” x 1” x 1.7")

Weight: 90 g (3.2 oz)

Light modes: Solid, peloton, night flash, day flash

Custom Light Mode Configuration: Yes (with Varia Mobile App)

Radar-Only Mode: Yes

Lumens: 25 solid, 8 peloton, 40 night flash, 100 day flash

Water Rating: IPX7

Battery Life: 10 hours solid, 15 hours peloton, 10 hours night flash, 24 hours day flash, 30 hours radar-only

ANT+®: Yes (radar, bike lights)

BLE: Yes (radar, bike lights)

Viewing angle: 220°

Visibility Distance: 2 km

Rear Tail Light: Yes

Brake Light: Yes

Rear Radar: Yes

Lateral Vehicle Positioning: Yes

Vehicle Size Classification: Yes

Vehicle Threat Classification: Speed-, size- and lateral range-based

Maximum Vehicle Detection Range: 175 m

Radar Beam Width: 60°

Varia™ App Compatibility: Yes

Security Updates Until At Least (YYYY-MM-DD): 2028-02-03

In The Box
Varia™ RearVue 820 radar tail light

Mounting kit

Charging Cable

Documentation

About Garmin
Garmin is a technology company best known for its GPS equipment than spans automotive, aviation, marine, outdoor and sports activities. The company was founded by Gary Burrell and Min Kao in 1989 in Kansas, United States. The company name an acronym of the first names of the two founders Gary Min. They have now grown into a market leader in GPS systems.