The Preferred Pack PP709 is a combination folding, stapling and carton sealer in one machine. The sealer has easy to use manual size adjustments to fix the machine to the dimensions of the box being sealed shut. Top and bottom drive belt design. The PP709 runs at production speeds completing 6-8 boxes per minute for shipping or storage. It will automatically adjust and handle various box sizes in just seconds. Simply feeds the boxes into the machine and it will automatically adjust to meet the carton dimensions. The box size must be at least 8 inches in length and a maximum of 24" in length to be properly sealed. The height and width must be larger than 8 inches and less than 20 inches.