The Varia RVR 315 radar provides visual and acoustic alerts to warn of vehicles approaching from behind at a distance of up to 140 meters. This way, you can see what’s happening behind you while riding. The smart and compact radar can be paired with the Edge bike computer or a compatible smartphone, as well as certain Garmin wearables. You can now ride more safely. With the smartphone app, you receive alerts on your phone. This includes graphical representations, as well as sound and vibration alarms that indicate the position and speed of approaching cars. When used with a compatible smartphone, the Varia radar integrates with your favorite apps to overlay maps with radar alerts. Easily mount the sleek, compact radar on the seat post of almost any bike for road use. Its vertical design does not obstruct your legs while riding and does not affect the riding experience.