Garmin Varia RearVue 820 Radar Tail Light with Advanced Features

Varia™ RearVue 820 is a rearview radar and tail light that alerts cyclists to approaching vehicles via their compatible cycling computer, smartwatch, or smartphone app. It offers enhanced visibility and can detect vehicle size and threat level.

• The description claims the radar detects vehicles approaching from behind and provides audible and visual alerts.
• The description claims the tail light provides visibility up to 2 km (1.24 miles) away.
• The description claims up to 24 hours of battery life in day flash mode and up to 30 hours in radar-only mode.