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Napco Security Technologies- Inc. (NAPCO)- incorporated on December 3- 1971- is a diversified manufacturer of security products- including access control systems- door-locking products- intrusion and fire alarm systems and video surveillance products. The Company's products are used for commercial- residential- institutional- industrial and governmental applications- and are sold worldwide principally to independent distributors- dealers and installers of security equipment. The Company's access control systems consist of a range of identification readers- including card readers- hand scanners; a control panel; a personal computer (PC)-based computer- and electronically activated door-locking devices. When an identification card or other identifying information is entered into the reader- the information is transmitted to the control panel/PC- which then validates the data and determines whether to grant access by electronically deactivating the door-locking device. DD493 NAPCO BLANK PROM ASSY MA900. We strive to offer you the best selection and the lowest prices. Please review the NAPCO DD493 and let us know what you think about it. For more information about the product- large/bulk order discounting or estimated shipping. The Company manufactures a range of door locking devices- including microprocessor-based electronic door locks with push button- card reader and biometric operation- door alarms- mechanical door locks and simple dead bolt locks. The devices control a single door- and in the case of the Company's microprocessor-based door locks- the devices network with its access control systems and control remotely. The Alarm systems consist of a range of detectors- a control panel- a digital keypad and signaling equipment. When a break-in occurs- an intrusion detector senses the intrusion and activates a control panel via hard-wired or wireless transmission that sets off the signaling equipment and causes a bell or siren to sound.