It is possible to replace the current 2‑wire internal unit with the Classe 300X:

• Villa or two‑family context: replacement without modification of the video door wiring
• Multi‑family condominium context: depending on the characteristics of your system, it may be sufficient to replace the internal unit or it may be necessary to add a dedicated power supply (ref. 346020)

For the sizing of multi‑family systems, refer to the General Installation Rules of the 2‑Wire System Technical Guide.