PowerTap ANT+ Dual Speed/Cadence Sensor

PowerTap's ANT+ Dual Speed/Cadence Sensor accurately tracks your speed and cadence and is used along with a power meter or with an ANT+-compatible cycling computer (power meters and ANT+ computers sold separately). This unit easily attaches on the frame next to your left crankarm and rear wheel to monitor and display your cadence, speed and distance on your cycling computer of choice.