TECHNOLOGY: Set up wheel size in Garmin Connect(TM) or self-calibrate with an Edge(R) cycling computer or compatible Garmin device ANT+(R) connectivity and BLUETOOTH(R) Low Energy technology let you sync to Garmin Connect(TM) and other training apps, compatible devices and fitness equipment USES: Receive accurate speed and distance data at all times, even without a head unit, when you ride indoors and outdoors SPECIAL FEATURES: No magnets or other exposed parts to line up makes the sensor easy to install, maintain and move between bikes Attaches to the hub of either wheel