Spinning Connect Dual Mode Cadence Sensor Compatible with both Bluetooth mobile devices, the cadence sensor only needs to be paired once when used with the Spinning apps -whether you use the sensor at home or in the studio. Train smarter and achieve your fitness goals! Features: Attaches to any Spinner bike or indoor cycling bike crank as well as most outdoor bikes to track and capture real-time cycling cadence (RPM) Dual-mode cadence sensor is compatible with both Bluetooth and ANT+ mobile devices Bluetooth and ANT+ mobile devices. One-time pairing when used with Spinning apps or other tracking apps - whether you use the sensor at home or in the studio Replaceable common CR2032 coin cell battery Specifications: Dimensions: H:1.0 x W:3.0 x D:4.0 cm Colour: Black Guarantee: 1 Year Limited Batteries Required: Yes Model Number: 7955REV3 Self Assembly Required: Yes