Six zone selection keys, all-call key and momentary PTT-key for calls
Selectable gain, speech filter, limiter, and output level for improved intelligibility
LED indications for zone selection, fault, and emergency state
Call station extension provides seven additional zone and zone group keys
Voltage range 24 VDC supplied by LBB 1990/00(or 18 to 24 VDC or VAC external power supply)
Current consumption <30 mA (plus <15 mA per keypad)
Nominal sensitivity 85 dB SPL (gain preset 0 dB)
