Monitor your ride speed with this easy-to-install wireless sensor. With no magnets or other exposed parts for alignment, this sensor is easy to install, store and move from bike to bike. This second-generation speed sensor attaches to the hub of one of your wheels. You can configure your wheel size in the Garmin Connect™ online community or calibrate it yourself with an Edge® cycling computer or compatible Garmin device. Once set up, you'll always receive accurate speed and distance data. The sensor stores your ride data even without an Edge or compatible device; once connected, the data will transfer between the two devices. ANT+® connectivity and Bluetooth® Low Energy technology let you sync your data to Garmin Connect and other training apps, compatible devices and fitness equipment for more accurate data about your indoor and outdoor cycling activities. The odometer function tracks distance to help you plan maintenance on your bike.