Garmin Varia RearVue 820

The Garmin Varia RearVue 820 represents the next generation of cycling safety, featuring Garmin's most powerful and precise rearview radar system to date. Engineered with a significantly wider 60° radar beam width, it tracks overtaking vehicles from up to 175 metres away, providing real-time data on vehicle size, closing speed, threat level, and lateral lane positioning. The integrated high-output intelligent tail light provides up to 2 km of daytime visibility and features an automated, deceleration-sensing brake light to alert motorists when you are slowing or stopping. With comprehensive ANT+ and Bluetooth connectivity alongside a rugged IPX7 waterproof rating, it integrates flawlessly with cycling computers, smartwatches, and smartphones to bring elite situational awareness to every ride. Specifications Radar & Detection Capabilities Maximum Detection Range: Tracks approaching vehicles up to 175 metres away. Radar Beam Width: Ultrawide 60° field of view for exceptional coverage on twisting roads, junctions, and wide lanes. Intelligent Tracking Metrics: Vehicle Size Classification: Categorizes and displays the size profile of approaching vehicles on compatible head units. Lateral Vehicle Positioning: Visualizes exactly where the overtaking vehicle is positioned within the lane relative to the rider. Vehicle Threat Classification: Dynamic speed-, size-, and lateral range-based calculations color-code the severity of approaching threats. Relative Speed Alerts: Retains consistent tracking and visibility alerts even for vehicles matching the cyclist's exact traveling speed. Smart Lighting Modes & Lumens Day Flash Mode: 100 Lumens of high-intensity visibility (visible up to 2 km / 1.24 miles away). Night Flash Mode: 40 Lumens optimized for low-light conditions. Solid Mode: 25 Lumens for steady, high-visibility output. Peloton Mode: 8 Lumens dimmed output, optimized to protect the vision of fellow riders when traveling in close group pacelines. Smart Brake Light: Automated structural feature that flashes or brightens dynamically to alert following motorists the moment you decelerate or stop. Custom Configuration: Fully customizable light mode profiles manageable via the Varia Mobile App. Battery Life Matrix The Varia RearVue 820 features highly optimized power management profiles based on active output modes: Active Mode Battery Run Time Radar-Only Mode (Light Off) Up to 30 Hours Day Flash Mode Up to 24 Hours Peloton Mode Up to 15 Hours Night Flash Mode Up to 10 Hours Solid Mode Up to 10 Hours Connectivity & Hardware Integration Dual-Band Wireless: Equipped with full ANT+ and Bluetooth Low Energy (BLE) architecture to transmit radar data and light control commands simultaneously. Ecosystem Compatibility: Seamless native integration with Garmin Edge cycling computers, compatible Garmin smartwatches, dedicated radar display units, and the standalone smartphone-based Varia mobile app. Physical Profile & Durability Dimensions: 98.9 x 25.9 x 43.2 mm (3.9" x 1" x 1.7") Weight: Lightweight 90 g (3.2 oz) chassis. Waterproof Rating: Fully IPX7 certified (withstands incidental exposure to water of up to 1 metre depth for up to 30 minutes; completely weather-sealed against heavy rain and road spray). Viewing Angle: 220° peripheral lighting coverage pattern to optimize side-on visibility at intersections. Technical & Security Lifecycle ️ Manufacturer Security Guarantee: Garmin officially guarantees dedicated software security updates and firmware patch maintenance for the Varia RearVue 820 hardware system until at least 30 December 2027.