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The Polar Bluetooth Stride Sensor is a small and lightweight sensor measures each stride, helping you analyze the effectiveness and efficiency of your run. It is compatible with any Bluetooth Smart Ready device, including latest Apple products like iPhone 4S, 5. Use the sensor with the Polar Beat app to track your indoor runs, all without GPS. Measure your speed and distance and then analyze and share post training. The Polar Stride Sensor Bluetooth comes with a new, firm shoe attachment which guarantees accurate speed and distance measurement.