Operated entirely by hydropower. No external power source needed.Strategic location of sensor at tip of spout for instant response time.Self-charging back-up battery. No battery replacement necessary.No wiring. Easy installation and low-cost maintenance.1.0 GPM water-saving flow rate.Flow Rate of .18 Gallon Per Cycle,10 Second - On Demand ADA compliant. Consist of Spout and Controller. Mixing Valve options available.