BOSCH LBB 1956/00 Plena Voice Alarm Call StationPlena Voice Alarm Call Station Product Features Stylish six zone call station for the Plena Voice Alarm System 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 Technical Specification Power supply Voltage range