Using your Bradley Zen Series touchless faucet is easy. Just wave your hands under the dual sensors, and the water will flow. You can choose from multiple low - flow options for different needs. For power, you can either use the included 4xAA alkaline battery pack or the optional AC plug - in adapter with battery backup. If the low - battery LED indicator on the sensor package lights up, it's time to replace the batteries. When it comes to maintenance, wipe the faucet regularly with a soft cloth to keep the Brushed Nickel PVD finish looking great. Avoid using abrasive cleaners as they can damage the finish. This faucet is vandal - resistant, but still, handle it with care. Also, since it complies with ADA guidelines, make sure to install it according to the recommended procedures for proper functionality. And remember, this is a non - returnable item, so take good care of it from the start.