Patented, electronically controlled, transparent safety shield in the feed opening; automatic power cut-off when cabinet is opened or shred bin is full; automatic reverse and power cut-off when overfed; double protection against overheating; Zero Energy Consumption sleep mode cuts off power supply after 30 minutes of inactivity. Automatic start and stop controlled by photo cell. High quality, hardened steel cutting shafts. Meets all NSA/CSS specifications and is DOD approved. 1 year warranty on the cutting shafts. Quiet and powerful single phase motor. Fully enclosed gear box housing. High quality wooden cabinet mounted on casters. Convenient, environmentally friendly shred bin does not require disposable shred bags.