GIANT ANT+ & BLE 2 in 1 Speed & Cadence Sensor. This sensor is an integrated digital sensor that measures both speed and pedal revolutions (cadence). Key Features: Dual Communication: Compatible with both ANT+ and Bluetooth Smart. This allows it to connect with various cycle computers and smartphone apps. Function: This sensor is built into the bicycle frame (chainstay) and uses magnets to measure speed and cadence. Uses: Useful for recording riding data and training analysis. Thank you for viewing.