Martin Yale 1616 Desktop Letter Opener, Easy One-hand Operation, Automatically Feeds and Opens Up To 3,000 Envelopes per Hour, Accepts Standard-sized Business Envelopes, Fully Enclosed Blades Automatically opens envelopes when inserted for easy one-hand operation Accepts standard sized business envelopes Blades are fully enclosed to protect fingers Non-skid rubber suction feet keep machine in place Low noise operation Automatically opens mail when inserted, allowing for easy one-handed operation. Durable, enclosed service-free cutter blades. Designed for desktop operation with nonskid rubber suction feet. Low noise AC operation.