Equipped with Surround Sensor™ Technology, Auto Faucet® delivers water only when needed, resulting in water savings of up to 70%. 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). Kit 5 Contains: spout, valve control module, mixing v alve, and hot/cold supply hoses (3/8" comp x 1/2" comp a 12" length). Kit 6 Contains: 0.5 GPM spout, valve control module, mixing valve, and hot/cold supply hoses (3/8" comp x 3/8" comp x 12" length). Touch-free activation eliminates cross-contamination. "Dry" cam-gear technology (solenoid valve-free) ensures trouble-free operation to reduce maintenance. Long battery life 400,000 cycles or 3 years. 4 "D" batteries included.