Automatic start and stop controlled by photo cell. Patented Electronic Capacity Control (ECC) indicator prevents jams by monitoring sheet capacity levels during operation. Automatic oil injection ensures optimal performance at all times (cross-cut and high security models). High quality, hardened steel cutting shafts take staples, paper clips, credit cards (strip-cut and 4 x 40 cross-cut models take CDs / DVDs).   High security models meet all NSA/CSS specifications and are DOD approved. Lifetime warranty on the cutting shafts (strip- and cross-cut models). 1 year warranty on high security cutting shafts. Quiet and powerful single phase motor rated for continuous operation. Sturdy Twin Drive System with fully enclosed gear box housing. High quality wooden cabinet mounted on casters. Convenient, environmentally friendly shred bin does not require disposable shred bags.