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Garmin Varia RVR315 PAY ATTENTION TO APPROACHING VEHICLES This rearview radar pairs with the Edge® cycle computer or compatible smartphone to alert you to vehicles approaching from behind. A reliable rear view radar that allows you to pedal knowing the traffic conditions. A radar. More viewing options. Pair it with your compatible Garmin device, smartphone, or both. Don't have an Edge® or other compatible device yet? No problem. The Varia ™ app has what you need. It is small, easy to assemble and is compatible with almost any bike. Extend the range of the radar with a battery life of up to 7 hours.