Introduction

WARNING

See the Important Safety and Product Information guide in the product box for product warnings and other important information.

WARNING

The device can improve situational awareness. It is not a replacement for cyclist attentiveness and good judgement. Always maintain awareness of your surroundings, and operate the bicycle in a safe manner. Failure to do so could result in property damage, serious injury, or death.

WARNING

Same-speed vehicle detection is limited or unavailable at slower speeds or when the device’s radar cannot detect the road due to factors such as snow, ice, heavy rain, other obstructions, or incorrect device mounting.

WARNING

The tail light can be programmed to emit light at varying degrees of brightness and flash at various intervals. Consult your physician if you have epilepsy or are sensitive to bright or flashing lights.

The Varia™ RearVue 820 radar tail light contains a micro radar that can detect vehicles behind your bike and estimate the vehicle size.

You must pair the device with the Varia app on your phone, or a compatible Garmin® watch or bike computer to use the radar features (Pairing).

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February 2026