Garmin Varia RearVue 820 Radar Camera Tail Light

Name: Garmin Varia RearVue 820 Radar Camera Tail Light
Brand: Garmin
SKU: 010-03180-00
Price: 299.99 USD
Availability: InStock

Garmin | SKU: 010-03180-00

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$299.99

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Product Information

The Garmin Varia RearVue 820 is a rear-facing bike radar and tail light that detects approaching vehicles over 190 yards behind the rider, estimates vehicle size and side-to-side movement, categorizes threat level, and pushes alerts to a compatible Garmin Edge bike computer, select Garmin smartwatches or the Varia app. The tail light is visible over 1.2 miles, peaks at 100 lumens in Day Flash, charges over USB-C and carries an IPX7 water rating.

Who it is for

It is built for road and gravel riders who train or commute on open roads with traffic, especially multi-lane roads where a car two lanes over should not trigger the same alert as one closing in your lane. Advanced vehicle tracking classifies vehicles as small, medium or large and tracks lateral movement, while same-speed tracking flags a vehicle following at a matching speed. Riders who want to be seen as well as warned get a brake-light function that fires a unique flash pattern when you slow or stop.

Key details

Detection over 190 yards (about 175 m) behind, across a 60 degree beam, with a wider field of view that reaches vehicles several lanes away.
Four light modes: Solid 25 lm, Peloton 8 lm, Night Flash 40 lm, Day Flash 100 lm, plus custom patterns built in the Varia app.
Battery life up to 10 hours Solid, 15 hours Peloton, 11 hours Night Flash, 24 hours Day Flash and 30 hours with the tail light off (radar only).
Rechargeable lithium-ion polymer battery with USB-C charging port.
IEC 60529 IPX7 rated, withstands water exposure up to 1 m for 30 minutes.
Seat post mount designed to fit road and gravel bikes; mount 250 to 1200 mm above the road.

Compatibility and sizing

Alerts display as a vehicle column on the side of the screen on compatible Garmin Edge bike computers, as vibration alerts on select Garmin smartwatches (voice alerts are in public beta), and in the Varia smartphone app. Garmin publishes a device compatibility checker at garmin.com/VariaRearVue820-CompatibleDevices. Connectivity is ANT+ and Bluetooth. Operating range is 5 to 122 F (-15 to 50 C); charge between 32 and 113 F (0 to 45 C).

DiveCatalog.com is an authorized Garmin dealer and a real dive shop in Irvine, California since 2003. Call 888-701-4017 or start a chat if you want help confirming your Edge or watch model works with the Varia RearVue 820 or checking mount fit on your seat post.

⚠️ WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.

Frequently Asked Questions

What devices work with the Garmin Varia RearVue 820?

It pairs with compatible Garmin Edge bike computers, which show a vehicle column along the side of the screen, with select Garmin smartwatches for vibration alerts, and with the Varia smartphone app. Voice alerts on select Garmin smartwatches are in public beta. Connection is over ANT+ and Bluetooth, and Garmin publishes a device compatibility checker at garmin.com/VariaRearVue820-CompatibleDevices if you want to confirm your model first.

How long does the Varia RearVue 820 battery last?

Garmin rates the built-in rechargeable lithium-ion polymer battery at up to 10 hours in Solid mode, 15 hours in Peloton, 11 hours in Night Flash and 24 hours in Day Flash. With the tail light switched off, the radar keeps working for up to 30 hours. Recharging is through the USB-C port, and charging should be done between 32 and 113 F (0 to 45 C).

Where on the bike does the Varia RearVue 820 mount?

It uses a seat post mount designed for road and gravel bikes, and Garmin's guidance is to mount it 250 to 1200 mm above the road.

Is the Varia RearVue 820 waterproof enough for rain?

Yes. It carries an IEC 60529 IPX7 water rating, meaning it withstands water exposure up to 1 m for 30 minutes, so riding in rain and road spray is fine. Operating temperature range is -15 to 50 C (5 to 122 F). IPX7 is a splash and immersion rating for cycling use, not a dive rating, so it is not intended for underwater use.

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Brand	Garmin
Model	Varia RearVue 820
Part Number	010-03180-00
Type	Rearview bike radar and tail light
Dimensions	98.9 x 25.9 x 43.2 mm (3.9 x 1.0 x 1.7 in)
Weight	90 g (3.2 oz)
Detection Range	Over 190 yards (about 175 m)
Radar Beam Width	60 degrees
Threat Classification	Vehicle size, side-to-side movement, threat level
Light Modes	Solid, Peloton, Night Flash, Day Flash
Light Output	100 lm Day Flash, 40 lm Night Flash, 25 lm Solid, 8 lm Peloton
Visibility Distance	Over 1.2 miles (2 km)
Battery Type	Rechargeable, built-in lithium-ion polymer
Battery Life	Up to 10 h Solid, 15 h Peloton, 11 h Night Flash, 24 h Day Flash, 30 h radar only
Charging Port	USB-C
Water Rating	IEC 60529 IPX7 (up to 1 m for 30 minutes)
Operating Temperature	-15 to 50 C (5 to 122 F)
Charging Temperature	0 to 45 C (32 to 113 F)
Wireless Frequency (connectivity)	2400 to 2483.5 MHz (<10 dBm)
Wireless Frequency (radar)	57 to 59.4 GHz (<20 dBm)
Connectivity	ANT+, Bluetooth
Mount	Seat post mount for road and gravel bikes, 250 to 1200 mm above the road
Versions Published	Varia RearVue 820, Varia RearVue 820 StVZO (Germany)