The Bosch LBB1956/00 is a six-zone call station for the PLENA Voice Alarm System. It lets operators make live announcements to selected zones or page all zones at once. Optional LBB1957/00 keypads add selection buttons for more zones or zone groups

The Bosch LBB1957/00 is a PLENA Voice Alarm Keypad that adds seven illuminated zone or zone-group selection keys to the LBB1956/00 Call Station. Connect up to eight keypads per call station for installations that need more paging selections.