Expandable from 4 to 28 zones in 4 zone steps, the MFP's features (4 sounder circuits, head-out fault indication and two on-board fire relays) plus its compatibility with a wide range of expansion boards makes it one of the most sophisticated BS5839-4 compliant fire panels available. Extremely popular in the Middle East and other non-European countries, the MFP boasts a wide range of engineering functions including one man detector test, sounder walk test, sounder isolate, sounder delay, auxiliary isolate and an optional short-circuit = fire facility (pre-1980 BS, no resistors in call points).