The Postmark 720 Envelope Sealer is a portable, desktop unit offering convenient sealing of all common envelopes, both nested and untested. Combat bottlenecks and extra wear and tear on mail room equipment used just for sealing. Or, if you are currently sealing envelopes manually, now you can avoid this messy, time-consuming task. With Postmark Model 720 fully automatic envelope sealer, you just load the envelopes and go! The unit automatically turns on when the envelope enters the machine and turns off when the envelope exits. Seal your mail and get it out the door, fast – up to 300 envelopes per minute!