Although the speech mechanism, according to the compatibility list would not fit adhoc / should I trod this path and can only say - with a little technical understanding is every older intercom facility to replace with this. I have this product installed within 2 months 2x and each time 100% successful. However, I want to emphasize again: a little technical understanding, use a multimeter would not indiscriminately tear advantageous and the old speech mechanism of the wall, without having previously noted, the cable connection to the contacts. Even photos are advantageous.
