Touch-free faucets in the home is catching on, and almost any faucet of any design can be activated by a new battery-operated system that is installed beneath the sink. The new system by Technical Concepts uses Surround Sensor Technology (SST), an invisible force that turns on the water as soon as hands come within a few inches above, below or along either side of the faucet. The water stops when the hands are withdrawn. A mixing valve, positioned under the sink, can be adjusted and set to maintain a fixed water temperature. The SST eliminates handles as well as the sensor eye commonly associated with commercial faucets.