{"product_id":"garmin-varia-rearvue-820","title":"Garmin Varia™ RearVue 820 Rear Light \u0026 Radar for Cycling Safety and Visibility","description":"\u003cp\u003eThe \u003cstrong\u003eGarmin Varia RearVue 820\u003c\/strong\u003e is Garmin's most advanced rear radar and light, stepping up from the \u003ca href=\"\/products\/garmin-rear-radar-varia-rvr315-p135469\"\u003eVaria RVR315\u003c\/a\u003e with a significantly wider detection range, a more powerful integrated tail light, an intelligent brake light, and vehicle size indication — making it the most comprehensive rear safety system in the Varia range. It detects approaching vehicles from up to \u003cstrong\u003e175 metres behind you\u003c\/strong\u003e and delivers real-time alerts to a paired Garmin Edge computer or the Varia smartphone app, giving you meaningful advance warning to adjust your road position before traffic arrives.\u003c\/p\u003e\n\n\u003cp\u003eThe integrated tail light is a serious piece of kit in its own right: visible up to \u003cstrong\u003e2km away\u003c\/strong\u003e in daylight conditions, it operates in solid, flash, and day flash modes with up to \u003cstrong\u003e24 hours of battery life in day flash mode\u003c\/strong\u003e — enough for even the longest rides without needing to recharge mid-route. The \u003cstrong\u003eintelligent brake light\u003c\/strong\u003e automatically activates when the device detects you decelerating, alerting drivers behind you that you're slowing — a feature that adds a meaningful layer of safety in traffic. The RearVue 820 also indicates the \u003cstrong\u003esize of approaching vehicles\u003c\/strong\u003e and alerts you to vehicles travelling at the same speed as you, giving you a more complete picture of the traffic situation behind.\u003c\/p\u003e\n\n\u003cp\u003eLike all Varia devices, the RearVue 820 integrates seamlessly with the full range of \u003ca href=\"\/collections\/computers-gps\"\u003eGarmin Edge computers\u003c\/a\u003e — including the \u003ca href=\"\/products\/garmin-computers-gps-edge-540-gps-unit\"\u003eEdge 540\u003c\/a\u003e, \u003ca href=\"\/products\/garmin-computers-gps-edge-840-gps-unit\"\u003eEdge 840\u003c\/a\u003e, \u003ca href=\"\/products\/garmin-edge-r-850-gps-unit\"\u003eEdge 850\u003c\/a\u003e, \u003ca href=\"\/products\/garmin-gps-unit-edge-1040-unit-only-p108757\"\u003eEdge 1040\u003c\/a\u003e, and \u003ca href=\"\/products\/garmin-gps-unit-edge-1050-p134310\"\u003eEdge 1050\u003c\/a\u003e — displaying vehicle alerts directly on your screen. It charges via \u003cstrong\u003eUSB-C\u003c\/strong\u003e and mounts cleanly to your seat tube or seatpost. Pair it with the \u003ca href=\"\/products\/garmin-front-light-varia-ut800-smart-headlight-trail-edition-p135439\"\u003eVaria UT800 front light\u003c\/a\u003e for a complete smart lighting system. Browse the full \u003ca href=\"\/collections\/garmin\"\u003eGarmin range\u003c\/a\u003e or explore our \u003ca href=\"\/collections\/lights\"\u003elights collection\u003c\/a\u003e and \u003ca href=\"\/collections\/rear-lights\"\u003erear lights\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003eIf you're deciding between the RearVue 820 and the \u003ca href=\"\/products\/garmin-rear-radar-varia-rvr315-p135469\"\u003eVaria RVR315\u003c\/a\u003e, the 820 offers a longer detection range (175m vs 140m), a more powerful tail light (2km visibility), the intelligent brake light, and vehicle size indication — making it the better choice for riders who regularly ride in traffic or at higher speeds.\u003c\/p\u003e\n\n\u003ch3\u003eWhat It's Good For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDetecting approaching vehicles up to 175m behind you with real-time alerts to a paired Garmin Edge or Varia app\u003c\/li\u003e\n\u003cli\u003ePowerful tail light visible up to 2km away in daylight — solid, flash, and day flash modes\u003c\/li\u003e\n\u003cli\u003eIntelligent brake light that automatically activates when you decelerate\u003c\/li\u003e\n\u003cli\u003eVehicle size indication and same-speed vehicle alerts for a more complete traffic picture\u003c\/li\u003e\n\u003cli\u003eUp to 24 hours battery life in day flash mode; USB-C charging\u003c\/li\u003e\n\u003cli\u003eRoad and sportive riding where rear traffic awareness significantly improves safety\u003c\/li\u003e\n\u003cli\u003ePairing with the \u003ca href=\"\/products\/garmin-front-light-varia-ut800-smart-headlight-trail-edition-p135439\"\u003eVaria UT800\u003c\/a\u003e for a complete smart front-and-rear lighting system\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat It's NOT Good For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOff-road MTB use where rear vehicle traffic is not a concern\u003c\/li\u003e\n\u003cli\u003eReplacing attentive riding and road awareness — the Varia is a safety aid, not a substitute for good road craft\u003c\/li\u003e\n\u003cli\u003eUse as a front light — this is a rear-only device\u003c\/li\u003e\n\u003cli\u003eRiders on a tighter budget who don't need the extended range and brake light — the \u003ca href=\"\/products\/garmin-rear-radar-varia-rvr315-p135469\"\u003eVaria RVR315\u003c\/a\u003e offers core radar functionality at a lower price\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the RearVue 820 differ from the Varia RVR315?\u003c\/strong\u003e\u003cbr\u003eThe RearVue 820 offers a longer detection range (175m vs 140m on the \u003ca href=\"\/products\/garmin-rear-radar-varia-rvr315-p135469\"\u003eRVR315\u003c\/a\u003e), a more powerful tail light visible up to 2km, an intelligent brake light, and vehicle size indication. The RVR315 is a more compact, lighter option for riders who want core radar functionality; the 820 is the better choice for riders who regularly ride in traffic or at higher speeds.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow does the intelligent brake light work?\u003c\/strong\u003e\u003cbr\u003eThe RearVue 820 uses its internal sensors to detect when you're decelerating and automatically activates a brake light pattern to alert drivers behind you. This happens automatically without any input from you — a genuinely useful safety feature in traffic or on descents where you're braking frequently.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhich Garmin Edge computers is it compatible with?\u003c\/strong\u003e\u003cbr\u003eThe Varia RearVue 820 is compatible with a wide range of Garmin Edge computers including the \u003ca href=\"\/products\/garmin-computers-gps-edge-540-gps-unit\"\u003eEdge 540\u003c\/a\u003e, \u003ca href=\"\/products\/garmin-computers-gps-edge-840-gps-unit\"\u003eEdge 840\u003c\/a\u003e, \u003ca href=\"\/products\/garmin-edge-r-850-gps-unit\"\u003eEdge 850\u003c\/a\u003e, \u003ca href=\"\/products\/garmin-gps-unit-edge-1040-unit-only-p108757\"\u003eEdge 1040\u003c\/a\u003e, and \u003ca href=\"\/products\/garmin-gps-unit-edge-1050-p134310\"\u003eEdge 1050\u003c\/a\u003e. It can also be used with the Varia smartphone app without a Garmin Edge computer.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I pair the RearVue 820 with the Varia UT800 front light?\u003c\/strong\u003e\u003cbr\u003eYes — both the RearVue 820 and the \u003ca href=\"\/products\/garmin-front-light-varia-ut800-smart-headlight-trail-edition-p135439\"\u003eVaria UT800\u003c\/a\u003e can be paired simultaneously with a compatible Garmin Edge computer, giving you a complete smart front-and-rear lighting and radar system controlled from a single screen.\u003c\/p\u003e","brand":"Garmin","offers":[{"title":"Default Title","offer_id":46540710281391,"sku":"010-03180-00","price":253.48,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0654\/2003\/4223\/files\/Screenshot2026-02-04093710.png?v=1770197931","url":"https:\/\/www.swinnertoncycles.co.uk\/products\/garmin-varia-rearvue-820","provider":"Swinnerton Cycles","version":"1.0","type":"link"}