Patented Surround Sensor[TM] activation creates an omni-directional sensing zone around the faucet spout. Dry cam gear technology eliminates outdated solenoid failures. Kit 1 Contains: Spout and valve control module. Kit 2 Contains: Spout, valve control module and main supply hose (1/2" pipe x 3/8" comp x 12" length). Kit 3 Contains: Spout, valve control module, mixing valve and hot/cold supply hoses (3/8" com x 3/8" comp x 12" length). Kit 4 Contains: Spout, valve control module, thermostatic mixing valve and hot/cold supply hoses (3/8" com x 3/8" comp x 12" length).