The M490P locks have automatic voltage sensing for 12 and 24 volts along with polarity protection to make wiring less complex Bayonet mount makes installation simpler by not requiring magnet to be held overhead while mounting screws are installed New design allows for RH/LH configuration in the field Armature mount allows armature to pivot compensating for slight opening imperfections 1500 lb. Hold Force 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 Relock Time Delay (RTD) provides a relock delay that is adjustable from 0.5 to 30 seconds Kits are available for top jam, double door, and glass door applications The M490 is tested and certified to meet or exceed UL1034 and BHMA 1500lb. hold force requirements Satin Aluminum 628 Finish