ZP755 HA is designed with dual front and rear sound paths, providing an ‘all around’ sound output - ideal for open area coverage. Whilst the ZP755 HB features a ‘forward directional’ output, making it effective in corridors, passageways and on escape routes. Installed directly onto and powered by the ZP wiring loop - ZP755 HA and HR enable the system designer to offer a complete ZP3 analogue addressable system on a single pair of wires. The units high efficiency acoustic design, together with a low energy, ‘sound gun’ transducer, enables combinations of up to 100 sensors and 85 sounders to be connected to a one kilometre loop of 1.5 mm2 cable. An optional first fix plate accepts all loop and screen wiring, prior to the sounder connection via a single pair of leads.