I didnt expect an on off switch on the back of the trash cans. It can easily get switched to the off position becaus of its location. The sensor goes to sleep and can take awhile to sense your presence. The batteries are huge and heavy it requires C. The openclose works only if the batteries are in a d the switch is in the on position. I think adding a foot pedal in the front of the trash can that operates at all times would be beneficial.