Using this Bobrick faucet is easy. Just place your hands under the faucet, and the hidden sensor will detect them and start the water flow. To conserve battery, it has an adjustable time - out feature, so the water will stop flowing after a set time. The unit uses 4 “AA” batteries, so keep spare ones handy. When installing, make sure to connect the in - line filter properly to prevent debris from entering. For maintenance, clean the sensor lens gently with a soft cloth to keep it sensitive. Check the batteries regularly and replace them when the water flow becomes weak. Also, use the line purging feature occasionally to keep the pipes clean and ensure a smooth water flow.