IEI-MAX3MOD EX IEI MAX3 MODULE SINGLE DOOR ACCESS CONTROL KIT FOR SYSTEM EXPANSION. PLUGS INTO MAX3 BACKPLANE TO EXPAND SYSTEM CAPACITY ONE DOOR AT A TIME. CONTAINS MAX 3 DOOR CONTROL MODULE AND INCLUDES XF 1050 PROXIMITY READER THAT IS AWID HID XCEEDID; CASI/PROXLITE COMPATIBLE.