Up to 2 years operation, over 100,000 cycles. Uses (4) "D" size batteries. Compact and unobtrusive. Eliminates blood-borne cross-contamination. Contemporary slim-line form complements all washroom décor. Opening simplifies the unobstructed posting of waste. Minimizes sight into the unit. Discourages disposal of general rubbish. Compact wall-mount design: greater utilization of washroom space; ease of cleaning under and around unit.