All steel construction is ideal for high-traffic areas where vandalism is a concern. Paper 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 (included). 4 alkaline batteries have been 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 of touchless paper towel dispenser. 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 6-9” length of towel.