The Plena call station is a stylish high-quality callstation with a stable metal base design a flexiblemicrophone stem and a unidirectional condensermicrophone. It can make calls to selected zones (oneto six and all-call) in a public address system built withthe Plena Voice Alarm System. In addition to tabletopuse the special design allows it to be neatly flushmountedin desktops. The Plena Voice Alarm Keypad(LBB 1957/00) is an extension adding seven additionalkeys.Stylish six-zone call station for the Plena VoiceAlarm System Six zone selection keys all-call key and momentaryPTT-key for calls Selectable gain speech filter limiter and outputlevel for improved intelligibility LED indications for zone selection fault andemergency state Call station extension provides seven additionalzone and zone group keys