DoorKing, Inc. is a leading manufacturer of innovative products for the access control industry. We manufacture a variety of ... PC programmable Telephone Entry and Multi-Door Card Access Systems, Telephone Intercom Systems, High Security MicroPLUS® RF Transmitters and Receivers and Digital Keypads. Our vehicular access control products include Slide, Swing and Barrier gate operators, Maximum Security slide gate operators, standard traffic control spikes and automated traffic control spike systems. read more