Garmin Varia RearVue 820 Radar Tail Light Description: The Garmin Varia RearVue 820 Radar Tail Light is a sleek and compact device that will dramatically improve a riders visibility and safety so they can focus on getting more out of their ride. When paired with a compatible Garmin Smartwatch, Garmin GPS/Cycling computer, or on a smartphone with the Varia app, this precise and powerful radar-equipped tail light transmits valuable information regarding a vehicle's size, speed, and position on the road to the rider so the rider can adjust their riding patterns for optimal safety. Additionally, a powerful LED tail light with multiple lighting patterns and side cut-outs for improved side visibility alerts motorists and other users of the roads and trails to the riders position. Best of all, the set up for the Garmin Varia RearVue 820 Radar Tail Light is easy so a rider can quickly get out for a fun time on the bike. Features: Sleek and compact design attaches to the seatpost of most bicycles and will improve the awareness of the surroundings and the visibility so anyone on the road and trails is made aware of a riders position Radar detects vehicles approaching from up to 175 meters (more than 190 yards or 570 feet away) and has a wide field of view Advanced vehicle tracking sends an alert letting a rider know the size of a vehicle (small, medium, large), if it is changing lanes, and its safety threat level to compatible electronics Able to connect/pair with Garmin Smartwatches, Garmin GPS/Cycling Computers, and with smartphones through the Varia App Powerful LED tail light alerts motorists to your presence as soon as possible with daylight visibility up to 1.24 miles (or 2km) away Red inserts on the side of the black housing lets light to shine through, improving side visibility 4 different light patterns are pre-loaded into the light so you can tailor the visibility to the light conditions and whether or not you are riding by yourself; custom lighting patterns can be created in the Varia app on a smartphon...