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Compact black radar tail light unit with USB-C cable and car charger adapter

Garmin

Garmin Varia RearVue 820 Radar Tail Light Bundle

SKU CH-SJJF-9E7P7

Radar detects vehicles 175 metres behind while a 2 km tail light with automatic brake alert runs up to 24 hours

  • TypeGPS Tracking Device
  • App-EnabledYes
  • Width3.6
  • Real-time rear traffic awareness up to 175 metres away
  • High-visibility tail light seen from 2 km distance
  • Automatic brake light flashes when you slow down
  • Up to 24 hours battery life in day flash mode
  • Alerts sent to compatible Garmin devices or smartphone app

Garmin Varia RearVue 820 Radar Bundle

The Garmin Varia RearVue 820 combines rear-view radar detection with a high-visibility tail light in one compact unit. It tracks vehicles approaching from up to 175 meters behind with a wide field of view for earlier awareness. The system pairs with compatible Garmin Edge computers, select smartwatches, or the Varia smartphone app to deliver visual, audible, or haptic alerts. A built-in brake light activates a distinct flash pattern when you slow down.

Road cyclists and commuters seeking rear awareness

This bundle suits road riders, daily commuters, and endurance cyclists who want real-time traffic alerts from behind. It is not designed for riders who do not own or plan to use a compatible Garmin display or smartphone mount. Buyers needing a standalone light without radar functionality should consider a simpler tail light. The system requires a paired device to show vehicle distance, speed, and threat level.

Simple mounting with app pairing required

The device mounts to a standard seatpost and charges via the included USB adapters and cables. Setup involves pairing the radar with a compatible Garmin device or the Varia app before the first ride. Battery life reaches up to 24 hours in day flash mode for long rides. The most common issue is forgetting to pair the unit, which leaves the radar silent despite the light working.

Highlights

  • Real-time rear traffic awareness up to 175 metres away
  • High-visibility tail light seen from 2 km distance
  • Automatic brake light flashes when you slow down
  • Up to 24 hours battery life in day flash mode
  • Alerts sent to compatible Garmin devices or smartphone app

Specifications

BrandGARMIN
TypeGPS Tracking Device
App-EnabledYes
Width3.6

Questions about this item

Which Garmin Edge computer or smartwatch do I need to pair with the Varia RearVue 820 to see vehicle alerts?

The radar pairs with compatible Garmin Edge cycling computers and select Garmin smartwatches to display approaching-vehicle distance, relative speed and threat level on their screens.

Can I keep using my current tail light while the Varia RearVue 820 radar is active?

The unit combines radar detection and a high-visibility tail light in one device, so it replaces your existing rear light rather than working alongside it.

How do I confirm the Varia RearVue 820 is tracking traffic correctly after mounting it?

Ride with a paired Edge computer or the Varia app; approaching vehicles will appear on the display with distance and speed data, and the tail light flashes a distinct pattern when you brake.

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