Touch-free activation eliminates cross-contamination to help reduce the spread of germs. Surround Sensor™ technology creates a 3'' omni-directional sensing zone guaranteeing activation every time. Patented ''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. Optional AC power adapter available. UPC Low Lead Listed.