The Garmin Varia RVR315 Rear View Radar pairs with your Garmin Edge bike computer or compatible smartphone to alert you of vehicles approaching from behind. The Garmin Varia RVR315 Rear View Radar provides visual and audible alerts for vehicles approaching from behind up to 140 metres away. This radar works seamlessly with your Edge bike computer or compatible smartphone as well as select Garmin wearables. 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 RVR315 Rear View Radar 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.Don’t have an Edge® or other compatible device yet? No problem. The Varia™ app has you covered.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 7 hours of battery life.