Garmin Varia RearVue 820 Radar Tail Light, Model 010-03180-00

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Product guide

Garmin Varia RearVue 820 Radar Tail Light, Model 010-03180-00

Model: Garmin Varia RearVue 820 combines rear-approach radar alerts with a tail light and brake-light flash pattern. Pair it with a compatible Edge cycling computer, Garmin smartwatch or the Varia smartphone app to receive alerts, and note that same-speed tracking may be unavailable at slower speeds or when radar is obstructed.

At a glance

Radar alerts for vehicles approaching from behind, with visual and audible alerts on compatible Garmin devices or the Varia app.
The listing describes vehicle-size and threat-level indications, plus tracking of vehicles following at the same speed or attempting to pass.
Tail light includes a distinctive brake-light flash pattern and four named patterns: day flash, night flash, solid and peloton.
Peloton mode uses a lower-intensity flash for riders behind. The Varia app can also be used to create custom light patterns.
The seatpost mount is listed as standard. A compatible Varia seat-rail mount kit is sold separately.

Price

$349.99Save 17%

Reference price: ~~$419.99~~

Price checked: Nov 13, 2026

View offer

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Pros and cons

Pros

Combines rear-approach radar alerts and a rear light in one listed device.
The claimed 2 km visibility distance and brake-light pattern are intended to make the rider more noticeable from behind.
Two mode-specific battery-life claims cover light use and radar-only use rather than implying one runtime for every setting.
Multiple light patterns include a lower-intensity option for group riding.

Technical specifications

14 specifications

Identity
Brand	Garmin
Model	010-03180-00

Power and battery
Power configuration	Battery Powered
Battery life, day flash mode	up to 24 hours
Battery life, radar-only mode	up to 30 hours

Lighting and radar
Maximum light output	500 lumens
Light settings	4
Visibility distance claimed	up to 2 km (1.24 miles) away

Dimensions and installation
Mounting type listed	Seatpost Mount
Weight listed	91 g

Materials and protection
Water resistance listed	Waterproof
Material listed	Plastic
International Protection Rating	IPX7

Design
Colour	Black

What to know before buying

Same-speed tracking may be unavailable at slower speeds or when radar is obstructed. The stated battery runtimes apply to day flash and radar-only modes, not necessarily other light settings.
Radar alerts require a compatible Edge cycling computer, Garmin smartwatch or the Varia app on a smartphone. The seat-rail mount kit is sold separately.

Listing details to confirm

Listing details are inconsistent for dimensions: one entry gives 43L x 99W x 25H millimeters, while another gives 14.22 x 9.91 x 7.11 cm; 90.72 g. The listing also gives weight separately as 91 g, so confirm the dimensions and weight details for the selected listing.

What’s in the box

Included

Varia RearVue 820 radar tail light
Mounting kit
Charging cable
Documentation

Who is it for?

A good fit for

Road cyclists who want rear-approach alerts and a tail light in one unit.
Riders using a compatible Garmin Edge computer, Garmin smartwatch or smartphone with the Varia app for alerts.
Group riders who want a lower-intensity peloton light pattern.

Less suited to

Riders who need radar alerts without a compatible Garmin device or the Varia smartphone app.
Buyers who require a seat-rail mount in the standard mounting setup, since that kit is listed as sold separately.

Garmin Varia RearVue 820 Radar Tail Light, Model 010-03180-00 · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.3 / 5 · 133 ratings

5 stars72%72%
4 stars7%7%
3 stars10%10%
2 stars2%2%
1 star9%9%

Customer feedback describes the radar warnings, battery life and visibility positively, while also reporting disappointment with some aspects. Functionality, value and connectivity are described as mixed, and accuracy receives criticism. For riders choosing this radar-and-light combination, those concerns make alert behaviour and device compatibility especially relevant, while the listed runtime and visibility remain manufacturer claims rather than customer-verified specifications.

Positive themes

Customers describe the radar warnings as useful for noticing approaching vehicles.
Customer feedback is positive about battery life and visibility.

Negative themes

Feedback includes criticism of radar accuracy and reports that some aspects did not meet expectations.

Mixed feedback

Customer impressions vary on functionality, value for money and connectivity.

Frequently asked questions

How do you receive the radar alerts?

The listing says alerts are available on a compatible Edge cycling computer, a Garmin smartwatch or the Varia app on a smartphone. Confirm that your chosen device is compatible.

How long does the battery last?

Garmin lists up to 24 hours in day flash mode and up to 30 hours in radar-only mode. These are different operating modes, so they should not be treated as one runtime for all use.

Can it track a vehicle travelling at the same speed?

The listing describes same-speed tracking, but says it may be unavailable at slower speeds or when radar is obstructed.

What mounting options are listed?

The listed mount is a seatpost mount. The product is also described as compatible with a Varia seat-rail mount kit, which is sold separately.