MAG2/ MAG4 maintains up to 2 and 4 zones with fire detectors and call points. The MAG2 and MAG4 panels have a small size, handy cabinet, internal self-testing for 8 faults. MAG4 plus maintains up to 16 zones with fire detectors and call points. The panels have been designed to operate with one 12V battery back-up power, which reduces the costs by the value of 1 battery per system.