Using the Wahoo RPM speed sensor is a breeze. First, find the front wheel hub of your bike. Use the provided hub mounting option to attach the sensor securely to it. Once it's mounted, turn on your smartphone or bike computer. Enable Bluetooth or ANT+ on your device and search for the RPM speed sensor. Connect them, and you're ready to start tracking your speed. When it comes to the battery, the CR 2032 battery is already installed. But when it runs out, you can easily replace it with a new one. As for maintenance, keep the sensor clean and dry. Avoid exposing it to extreme temperatures or harsh weather conditions. If you have any issues or questions, refer to the quick start guide or the important product info guide that comes with the package.