The TOTO Libella Semi-Vessel ECOPOWER 0.5 GPM Touchless Bathroom Faucet, 20 Second Continuous Flow is ideal for high-traffic spaces, providing an elegant water conservation solution. Powered by the force of running water, the ECOPOWER hydro-turbine creates an electrical current that is stored in rechargeable cells to power operation of the faucet. No external power source, wiring, or battery replacement is necessary. The ECOPOWER system is highly efficient, replenishing power stores with no minimum daily usage. The sensor is strategically positioned underneath the spout head to accurately sense the hands for touchless use. The 0.5 GPM 20 second continuous flow faucet uses only 0.17 gallons per cycle and is CEC and CALGreen compliant. The water will flow continuously for 20 seconds, preventing water waste from the faucet being left running. The ECO CAP aerating technology balances the amount of air bubbles in the water for a comfortable experience while saving water. Included items: spout, operating controller and mounting hardware included. Purchased separately: water supply line for G 1/2 inch connection.