Built-in loudspeaker set for audio and video systems Since this set can be used for audio and video systems, no house stations are included. The set includes: . A built-in loudspeaker Order No. 346991 for existing mailbox systems or special panels for connecting up to 8 external call buttons. . REG door opener relay Order No. 346230 for connecting the door opener . Video power supply Order No. 346050 . Camera interface Order No. 347400 for integrating an external camera with the standard video signal FBAS 1Vss at 75 Ohm (see page 21 for camera selection) . Configurator set Order No. 306064 for expansion