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The Schlage M490DE delayed egress locking system is designed to meet NFPA 101 Life Safety Code while providing the same robust, easy-to-install security of our M400 Series line of electromagnetic locks. The M490DE has a 15 second delayed egress timer with audible alarm which can be configured to trigger by an internal plunger switch or by external contacts, such as a request-to-exit push bar. All M400 Series locks have automatic voltage sensing for 12 and 24 volts along with polarity protection to make wiring less complex. The M490DE is tested and certified to meet or exceed UL special locking arrangements and BHMA 1500 lb. hold force requirements. The M490DEP provides intelligent sensing and reporting features needed to integrate with access control systems. This easy-to-install and effective solution provides the highest access security and safety. Features and benefits: Magnetic Bond Sensor (MBS) monitors the strength of the bond between the lock and armature so you know the door is secure Door Position Switch (DPS) monitors whether the door is open or closed Relocking time delay Bayonet mount makes installation simpler by not requiring magnet to be held overhead while mounting screws are installed Automatic voltage selection LED indication with audible alerts Release input, reset input, fire alarm input 1500 lb hold force.