Using this water faucet is easy. Just turn it on, and the hands-free sensor will detect your hands and release water. For battery replacement, simply open the battery compartment and insert new batteries. Keep the faucet clean by wiping it regularly with a soft cloth. Avoid using abrasive cleaners as they may damage the polished finish. If there are any issues with the sensor, check the battery level first. That's all you need to know to keep this faucet working great!