The Garmin rear radar VariaRVR315 pairs with an Edge® bike computer or compatible smartphone and alerts you of vehicles approaching from behind. Thanks to the reliable rear radar, you can drive like you know what to expect. One radar, multiple display options. Pair it with a compatible Garmin device, phone, or both. Don't have an Edge® device or other compatible device yet? No problem. The Variaapplication takes care of the situation. It is small, easy to attach and works on almost all bikes. Make effective use of the radar's battery life of up to 7 hours. MAXIMIZE YOUR AWARENESS The VariaRVR315 rear radar shows and sounds alerts for vehicles approaching from behind up to 140 meters away. MULTIPLE PAIRING OPTIONS The radar works seamlessly with the Edge bike computer or compatible smartphone, as well as select Garmin wearables. SUPPORTS VARIA APP This smartphone app increases your awareness by indicating the location and speed of approaching cars both visually and with sound and