Velo VeloComputer Sound of Motion Bluetooth Sensor and Power Meter, Black Current, max, average power (WATT) and current, max average speed in both KM, MPH and MPS Acceleration and deceleration, current max and average cadence (RPMs) as well as current, max and average heart rate (BPM) Trip distance, odometer, rider time, lap counter Current, max and min decline and auto start/stop Works with I phone and Android systems and Bluetooth 4.0 Current, max, average power (WATT) and current, max average speed in both KM, MPH and MPS Trip distance, odometer, rider time, lap counter Current, max and min decline and auto start/stop Works with I phone and Android systems and Bluetooth 4.0