Garmin Speed Sensor 2 and Cadence Sensor 2

Cadence sensor uses an Accelerometer to calculate your cadence Speed Sensor uses Magnetometers to calculate your speed and distance and is mounted on the hub of your wheel The Speed Sensor 2 attaches to the hub of either wheel, self-calibrates with your Edge cycling unit to give you accurate speed and distance. The Cadence Sensor 2 fastens to any size crank arm and measures pedal strokes per minute so you can get the most out of your training Send live speed, distance and cadence data to compatible training apps or displays by using ANT+ connectivity and Bluetooth Low Energy technology. With both of these sensors on your bike, you can work to improve your personal best or see where you stand against the pros.