Sensor Type: Motion sensor for hands-free operation Dispensing Mechanism: High-efficiency pump mechanism for smooth and precise dispensing Power: Operates on 4 AA batteries (not included) Design: Compact and modern design with a transparent soap chamber for visibility Compatibility: Works with SimpleHuman liquid soap refills Included: Comes with a soap sample for immediate use Features: Waterproof for easy cleaning Variable dispensing to control the amount of soap dispensed Energy-efficient with a long-lasting battery life