The Model 3140S is a Medium / Heavy Duty STRIP CUT Shredder that is ideal for office and/or departmental use. It features auto start/stop and a wide 16" feed opening. It has additional manual start/stop/reverse buttons; modern visual display with "ready to operate" indicator; automatic reverse in case of paper jams; bag full and door open shut off; electrically secured door and a solid steel cutting head. It produces a Strip Cut waste particle that is 5/32". The unit also includes a SPS System ( Safety Protection System ). The SPS is an electronically controlled saftey flap in the feed opening as an additional safety feature to help prevent industrial accidents and/or overfeeding.