From Securitron Magnalock Corp., the iMXD is an one-piece exit delay package that include built-in delay electronics, audible alarm, keyswitch for reset and authorized release self-contained in a stainless steel housing. The iMXD Series works with existing fire and non-fire- doors rated hardware with no obvious initiate switch that eliminates tampering. Unlike other door movement devices, the iMXD does not cause “false alarms” due to changes in building pressure or door “rattling” by using the reverse action plunger. To allow code compliant door—movement initiation, up to 1 inch, while allowing automatic door return re-latch in case of accidental exit delay initiation.