Electromagnetic Lock, Surface Mount, Opening Action Electromagnetic, Aluminum, Amp Draw @ 12V 139mA, Amp Draw @ 24V 69mA, Input Voltage 12/24V DC, Features For Use on Outswing Doors, Selectable to NO or NC, Strike Plate Mounting Template, Tamper Switch Sends an Alarm Output If The Cover is Removed, Holding Force (Lb.) 1,200, Armature Length (In.) 10 7/8 in, Armature Width (In.) 2 in, Armature Depth (In.) 9/16 in, Lock Body Length (In.) 11 1/2 in, Lock Body Width (In.) 2 1/2 in