For the purpose of ensuring backward compatibility when replacing or expanding door intercom stations with modules from series 147xx using modules from series 187xx. Note: Please refer to the note in the Information chapter, cross connectors. Delivery includes: 2 pieces.

3-tone gong display element, image memory expansion component for door/video intercom system, expansion component for door station, expansion component for house station, listening block, mounting aid, mounting accessories for door communication, call disconnector, call relay, call volume control, switch module, buzzer, button module, push button, table console, table mounting kit, table accessories, UP accessories.