STRIKINGLY VISIBLE. REMARKABLY POWERFUL. Varia RearVue 820 features our most powerful and precise radar yet with a wider field of view, giving you more reliable alerts than ever before. The tail light offers up to 2 km (1.24 miles) of visibility and has a brake light that shows when you&';re slowing or stopping. TRACKS VEHICLES UP TO 175 METERS (MORE THAN 190 YARDS) AWAY WITH WIDER FIELD OF VIEW GET UP TO 24 HOURS OF BATTERY LIFE IN DAY FLASH MODE BRIGHT TAIL LIGHT IS VISIBLE UP TO 2 KM (1.24 MILES) AWAY SEE THE SIZE OF APPROACHING VEHICLES1 BRAKE LIGHT ALERTS OTHERS THAT YOU&';RE SLOWING OR STOPPING STAY ALERT TO VEHICLES TRAVELING AT THE SAME SPEED2 1When riding with your compatible EdgeA(R) cycling computer or the Varia(TM) app on your smartphone. 2Same-speed tracking is limited or may be unavailable at slower speeds or when radar cannot detect the road (e.g., due to snow, ice, heavy rain, or other obstructions or incorrect device mounting). In The Box: Varia RearVue 820 radar tail light Mounting kit Charging cable Documentation General Dimension 3.9" x 1.0" x 1.7" (98.9 x 25.9 x 43.2 mm) Weight 3.2 oz (90 g) Light modes solid, peloton, night flash, day flash Custom light mode configuration yes (with Varia Mobile App) Radar-only mode yes Lumens 25 solid, 8 peloton, 40 night flash, 100 day flash Water rating IPX7 Battery life 10 hours solid 15 hours peloton10 hours night flash24 hours day flash30 hours radar-only ANT+A(R) yes (radar, bike lights) BLE yes (radar, bike lights) Viewing angle 220Adeg Visibility distance 1.24 mi (2 km) Rear tail light yes Brake light yes Rear radar yes Lateral vehicle positioning yes Vehicle size classification yes Vehicle threat classification Speed-, size- and lateral range-based Maximum vehicle detection range 175 m Radar beam width 60Adeg Connectivity Varia(TM) app compatibility yes