Unlike intercom systems, the use of a door phone from the Series 5 does not require a second wiring network: you utilize the features of the telephone (PBX) system. By optionally connecting the trunk line to this system, you can not only communicate within the building using the door phone but also make calls outside. The entrance door can be opened using the room phone, a standard DECT phone, or even a mobile phone. A simple and economical solution. Highlights: - Compact door phones in metal construction - Power supply via a/b line - Hands-free speaking/listening (full duplex) - Freely programmable direct call buttons - Illuminated labeling fields - Remote configuration possible - Custom voice announcements - External dimensions (H x W x D): 210 x 110 x 33 mm Additionally required for automatic voice announcement and lighting: - Plug-in power supply 40-10-4437 Product type: Door intercom Ear category (ElektroG): relevant, category 5: small devices Basic properties: Color: Silver.