Valcom's V-1094A Page Port Preamp/Expanders are a solid state audio amplifier that expands the number of Valcom amplified speakers on a zone. The V-1094A features a brushes stainless-steel plate with embossed numbers and bell box (single gang electrical wall box). The V-1094B does not include the bell box. The page port preamp/expander will interface 600-ohm type page ports to up to 150 Valcom amplified speakers or expand the number of Valcom amplified speakers on a zone by 150.