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Garmin Bluetooth and ANT + speed sensor, monitor your pedaling speed with this easy-to-install wireless sensor. Without magnets or other exposed parts for alignment, this sensor is easy to install, store and move from one bike to another. This second-generation speed sensor attaches to the hub of one of the two wheels. You can configure your wheel size in our Garmin Connect online community or calibrate it yourself with an Edge cycle computer or a compatible Garmin device. Once configured, you will always receive accurate data on speed and distance. The sensor stores the data of your outputs even without a compatible edge or device; once connected the data will be transferred between the two devices. ANT + connectivity and Bluetooth Low Energy technology will allow you to synchronize data on Garmin Connect and other training apps, compatible devices and fitness equipment for more precise data on cycling activities, indoors and outdoors. The odometer function detects the distance to help you plan maintenance on the bike.