Check the listing for details. Elk Products MM220 Single Zone Security System Magic Module, ELK-MM220. Condition: Used. Listed at 55.00 USD. Elk Products MM220 Single Zone Security System Magic Module, ELK-MM220Ships via USPS Ground Advantage > Pulled from working security system. The ELK-MM220 from ELK is a Magic Module™ (ELK-MM220) is a two digital input, two form C relay output programmable controller. It may be used as a stand alone field programmable controller in a vast array of applications from timers, single zone security system, pulse stretcher, simple process controllers, etc. The MM220 comes factory pre-programmed as a single zone security system and can be re-programmed by using a personal computer. The MM220 program is stored into re-programmable Electrically Erasable Programmable Read Only Memory (EEProm memory). The ELK-MB485 Data Bus Interface for Magic Module™ Series and the ELK-MM443 Magic Module™ Programmable Controller, 4 input, 4 output, iButton™ and X10® interface are required to program the ELK-MM220. Also available. ELK-MM443, a 4 analog/digital input, 4 relay output programmable controller.