SPECS

Overview

Short summary

For road and gravel cyclists riding on busy roads. Ideal for daytime training, commuting and group rides where traffic awareness is crucial for safety.

TECHNICAL DETAILS

Manufacturer

GARMIN

Brand Origin

USA

Made in

TAIWAN

Year of manufacture

2026

Registration required (cloud based)

Weight

90 gramm

Unit dimensions, WxHxD:

98.9 x 25.9 x 43.2 mm

Low battery warning

Operating temperature range

-20°C to 50°C

Guarantee or warranty ( for person )

2 years

Guarantee or Warranty (for company)

1 year

Training goal/ exercise motivation (Best = XXXXX)

Health care

XXXXX

Good feeling exercise

XXXXX

Battery Life (Accu)

Battery life (one charge)

10 hours solid, 15 hours peloton, 10 hours night flash, 24 hours day flash, 30 hours only radar

Charge time

full: 2.5 hours (15 min charge ≥ 2 hours runtime)

Technical specifications

Release date

FEB 2026

Average service time (my own experience)

1-4 days

Waterproof

Gloves to handle

Factory reset

Hold the device button for 8 seconds until all LEDs turn off. The reset will delete all pairing connections from the device.

SMARTPHONE FUNCTION

APP name

Garmin Varia APP

Android phones

iOS system (iPhone)

Sport Modes customization

Other interesting

My comments

Stabil működés, kevés falls jel, kiváló észlelés.

CÍCLING Light Compatibility

Connectable Wireless

Auto ON/OFF

Charge indicator

Brightness

25 lm (steady mode), 8 lm (peloton mode), 40 lm (night flash mode), 100 lm (day flash mode)

Brake light

Alerts You To Vehicles Approaching From Behind

175 m

Radar beam width

60°

Displays the speed of approaching vehicles

PACKAGE CONTENTS

Charging/data cable

USB-C

Bike Rear light

Other accessory

Garmin Varia™ RearVue Mount

Description

BRIGHTEST CYCLING RADAR WITH 175M VEHICLE DETECTION AND BRAKE LIGHT

Garmin Varia RearVue 820 features the most powerful bike radar with 175-meter vehicle detection range and advanced size recognition. The cycling tail light offers 2 km (1.24 miles) visibility with automatic brake light alerts when you're slowing or stopping. Perfect for road and gravel cyclists riding in traffic.

BRIGHTEST CYCLING RADAR WITH 175M VEHICLE DETECTION AND BRAKE LIGHT

Garmin Varia RearVue 820 radar detection range 175 meters

DETECTS VEHICLES UP TO 175 METERS AWAY WITH 60° WIDE-ANGLE RADAR

Garmin Varia RearVue 820 battery life 24 hours day flash mode

UP TO 24 HOURS BATTERY LIFE IN DAY FLASH MODE OR 30 HOURS RADAR-ONLY

Garmin Varia RearVue 820 bright tail light visible 2 km

100-LUMEN TAIL LIGHT VISIBLE UP TO 2 KM (1.24 MILES) IN DAYLIGHT

Garmin Varia RearVue 820 vehicle size detection small medium large

IDENTIFIES VEHICLE SIZE: SMALL, MEDIUM OR LARGE¹

Garmin Varia RearVue 820 automatic brake light alert when slowing down

AUTOMATIC BRAKE LIGHT ALERTS DRIVERS WHEN YOU'RE SLOWING OR STOPPING

Garmin Varia RearVue 820 same speed vehicle tracking detection

DETECTS VEHICLES FOLLOWING AT THE SAME SPEED OR WAITING TO PASS²

Garmin Varia RearVue 820 radar detection range 175 meters

DETECTS VEHICLES UP TO 175 METERS AWAY WITH 60° WIDE-ANGLE RADAR

Garmin Varia RearVue 820 battery life 24 hours day flash mode

UP TO 24 HOURS BATTERY LIFE IN DAY FLASH MODE OR 30 HOURS RADAR-ONLY

Garmin Varia RearVue 820 bright tail light visible 2 km

100-LUMEN TAIL LIGHT VISIBLE UP TO 2 KM (1.24 MILES) IN DAYLIGHT

Garmin Varia RearVue 820 vehicle size detection small medium large

IDENTIFIES VEHICLE SIZE: SMALL, MEDIUM OR LARGE¹

Garmin Varia RearVue 820 automatic brake light alert when slowing down

AUTOMATIC BRAKE LIGHT ALERTS DRIVERS WHEN YOU'RE SLOWING OR STOPPING

Garmin Varia RearVue 820 same speed vehicle tracking detection

DETECTS VEHICLES FOLLOWING AT THE SAME SPEED OR WAITING TO PASS²


	WHAT YOU'LL LOVE


	WHAT YOU'LL LOVE

175-METER VEHICLE DETECTION WITH 60° WIDE-ANGLE RADAR

The Garmin Varia RearVue 820 features the most powerful and precise bike radar technology, detecting vehicles approaching from up to 175 meters (191 yards) away with a 60-degree wide field of view for maximum awareness on the road.

100-LUMEN TAIL LIGHT WITH AUTOMATIC BRAKE LIGHT ALERT

The brightest Garmin tail light with 100 lumens means you'll be visible from up to 2 km (1.24 miles) away in daylight. The automatic brake light detects when you're slowing or stopping and alerts drivers with a unique flash pattern for added safety.

SMART VEHICLE SIZE DETECTION AND THREAT LEVEL ALERTS

Get real-time alerts for small, medium and large vehicles with lane change detection and threat level assessment. Works seamlessly with compatible Edge® cycling computers or the Varia™ app on your smartphone to show exactly what's approaching from behind.

175-METER VEHICLE DETECTION WITH 60° WIDE-ANGLE RADAR

100-LUMEN TAIL LIGHT WITH AUTOMATIC BRAKE LIGHT ALERT

SMART VEHICLE SIZE DETECTION AND THREAT LEVEL ALERTS

MULTIPLE ALERT OPTIONS: VISUAL, AUDIBLE AND HAPTIC

Connect this cycling radar to the Varia smartphone app, compatible Edge® bike computers or Garmin smartwatches for visual and audible alerts while you ride. Selected Garmin smartwatches offer haptic (vibration) alerts on your wrist, plus voice alerts for approaching vehicles — currently available in the Garmin Public Beta programme³.

4 LIGHT MODES PLUS CUSTOM PATTERNS VIA APP

Choose from four built-in light patterns: day flash for maximum visibility, night flash for low-light conditions, solid mode for steady illumination, and peloton mode which uses a low-intensity flash that's gentle on riders' eyes behind you. Create your own custom light patterns in the Varia™ app on your smartphone for personalized safety.

UNIVERSAL MOUNT FITS ROAD AND GRAVEL BIKES

The sleek, compact design with an improved seatpost mount fits cleanly onto almost any road or gravel bicycle. Also compatible with the Varia™ seat rail mount kit (sold separately) for versatile installation options. Easy to install and remove for charging.

MULTIPLE ALERT OPTIONS: VISUAL, AUDIBLE AND HAPTIC

4 LIGHT MODES PLUS CUSTOM PATTERNS VIA APP

UNIVERSAL MOUNT FITS ROAD AND GRAVEL BIKES

¹Vehicle size detection available when riding with compatible Edge® cycling computers or the Varia™ app on your smartphone.
²Same-speed vehicle tracking may be limited or unavailable at slower speeds or when radar cannot detect the road surface (e.g., due to snow, ice, heavy rain, obstructions or incorrect device mounting).
³Voice alert feature is currently in Garmin Public Beta testing and subject to future enhancements.

Product specifications and features are subject to ongoing engineering improvements and may differ from images shown.

In the box / Warranty

Garmin Varia™ RearVue 820 - Package Contents

Garmin Varia RearVue 820 radar tail light
Varia™ RearVue Mount
USB-C charging cable

Included online: invoice, warranty card, user manual in English, and list of recommended apps.

Garmin Varia RearVue 820 package contents with radar tail light and accessories

Garmin Varia RearVue 820 Warranty - 2 Year Protection

2-year warranty for consumers (also 2 years for businesses).
For warranty claims, any of the following is sufficient: invoice, warranty card, order number, or billing name.

Garmin official service partner - 2 year warranty coverage

Garmin Service Beyond Warranty - After-Care Support

Software Issue Resolution

We continue to resolve software issues free of charge whenever possible.

Fixed-Price Device Replacement

New replacement device at a fixed price determined by Navi-Gate Ltd (with just a few days turnaround).

Important Warranty Information

We do not provide warranty, service, or support for products not purchased from us or through Navi-Gate Ltd's authorized dealer network. For warranty or other issues with such devices, please contact the place of purchase or follow the support system provided at the time of purchase.