Fire alarm control panel, 16 zones, context, English

The traditional fire alarm control panel with sixteen zones can be expanded to 28 zones by adding panels 
Plug FF501Z.
Sturdy metal container with lift-off lid and heavy-duty base connections.
Microprocessor based design.
4 traditional sounder circuits.
Separate indicators for open circuit, short circuit, head out, power supply and battery/power supply faults.
The sounder inputs for class change are non-lockable, and fault outputs are non-lockable (via loom).
Area identifiable short circuit = fire facility (no resistors at connection points).
Up to 8 dual-wire repeaters per motherboard.
Space for two 12V 7Ah VRLA batteries.
Compatible with almost all known conventional fire detectors.
Wrong ringer mute facility