The Garmin Varia RTL515 Radar Tail Light is a rearview radar with tail light, paired with your Garmin Edge bike computer or compatible smartphone it will alert you of vehicles approaching from behind.The Garmin Varia RTL515 Radar Tail Light provides visual and audible alerts for vehicles approaching from behind up to 140 metres away. This radar works seamlessly with your Garmin Edge bike computer or compatible smartphone as well as select Garmin wearables or the optional radar display unit.Easily mount this sleek, compact device on the seatpost of almost any road-use bicycle. The vertical design allows for better leg clearance and a perfectly comfortable ride.Garmin Varia RTL515 Radar Tail Light FeaturesReliable rearview radar lets you ride like you know what’s coming.One radar. Multiple display options. Pair it with your compatible Garmin device, your phone or both.The Varia™ app has you covered if you’re using your phone as a primary or backup display.Shine brighter. Daylight visibility lets approaching vehicles see you from up to a mile away.It’s small, it’s easy to mount, and it works with just about any bike.Get more life out of your radar with up to 16 hours of battery life in day flash mode.