This bundle is a handy combination that allows you to monitor both your speed and cadence to accurately monitor your riding, with or without a head unit. Garmin Speed Sensor 2 Monitor your speed as you ride with this easy-to-install wireless sensor. Attaching to either wheel, you can set up wheel size in the Garmin Connect online community or self-calibrate with an Edge cycling computer or compatible Garmin device. Once set up, you’ll get accurate speed and distance at all times — even without a head unit. ANT connectivity and BLUETOOTH Low Energy technology let you sync to Garmin Connect and other training apps, compatible devices, and fitness equipment for better data when you ride indoors and outdoors. Garmin Cadence Sensor 2 Monitor your pedaling cadence as you ride with this easy-to-install wireless sensor. With no magnets or other exposed parts to line up, this sensor is easy to install, maintain and move between bikes. Simply attach the sensor and ride.