Garmin Cadence Sensor 2. Wireless cadence sensor, easy to install as it works without magnets or other exposed parts. It can be installed on any size crank and be easily be changed to another bike without having to set or align sensors. It measures the pedal hits per minute in order to get the best performance from your training. The ANT+® connectivity and Bluetooth® Low Energy technology allow you to send cadence data to the Garmin Connect™ virtual community and other training Apps, compatible devices and exercise equipment in obtain improved data indoors as well as outdoors.