Dispensing: The 109-70 is designed to dispense Jumbo 8" diameter (2-1/2" reserve roll) x 8" wide roll towels. Large detection zone senses hand when placed in a natural position under dispenser to deliver a 12” length of towel. Features: Towel delivery is quiet and uniform. Hands free dispenser reduces paper flow, and provides maximum hygiene. Operates with 4 “D” size alkaline batteries or plug in AC adaptor (add AC suffix to product code). 4 alkaline batteries have be independently tested and found to provide 35,000 hand dries. Comes with keyed tumbler lock to reduce pilferage and vandalism. Front loading for easy service and maintenance.