Proper hygiene is important in every home and the use of Sloan Valve EAF-150-ISM Optima IQ Battery Operated Sensor Activated Electronic Hand Washing Faucet makes proper hygiene easily achieved when using your toilet or bathroom. As its name suggests, the faucet has battery-operated sensor activated for a hands free washing experience. This being said, one needs not to have physical contact with the faucet promoting clean washing.