HPN Signature Series 16" x 20" Auto-Open Slide-Out Clamshell Heat PressIntroducing the HPN Signature Series! The quality and reliability of the HPN brand heat presses have been taken to a whole new level with the Signature Series. Featuring an auto opening electromagnet system, this robust feature allows the machine to automatically release the pressure when the timer hits 0. This HPN Signature Series Auto Open Heat Press is packed with a surplus of features that surely defines why we have coined this our Signature line