Using this Wahoo RPM cadence sensor is a breeze. First, decide whether you want to attach it to your bike's crank arm or your shoe. It comes with easy - to - follow instructions for both mounting methods. Once it's mounted, turn on your smartphone or GPS bike computer and pair it with the sensor via Bluetooth Smart or ANT+ technology. You'll start seeing cadence data right away. When it comes to maintenance, keep it dry and clean. Avoid exposing it to extreme temperatures. If it's not working, check the battery. You can easily replace the battery when it runs out. Also, make sure to update the sensor's software regularly for the best performance.