Is my intercom compatible with SoundKey?
Almost certainly, yes. SoundKey doesn't mimic the intercom's signals: it connects to your intercom's door-release button and presses it. So the brand, the model, and whether it's analogue, 2-wire or a video intercom don't matter.
The 10-second test
Go to the intercom in your flat and press the button that opens the building door (the one with the key symbol).
It's a physical push button. SoundKey presses it for you, just like your finger.
We're testing a kit for touch buttons. Sign up and we'll let you know when it's ready.
Two more details worth knowing:
- Some intercoms only open during the call (Fermax VDS or Duox, for example). That's not a problem: SoundKey presses right after it hears the buzzer.
- Some only open with the handset lifted. If that's your case, tell us when you join the waitlist: a version that lifts the handset automatically is in development.
Compatibility by brand and model
An indicative list. What decides it is the button: if it goes down, it works.
| Brand | Model or system | Type | SoundKey | Nuki / Ring |
|---|---|---|---|---|
| Fermax | Loft, Citymax (4+n) | Analogue | Compatible | Usually works |
| Fermax | VDS | Digital | Compatible | Partial |
| Fermax | Duox, Duox Plus (Veo, Veo-XS) | 2-wire | Compatible | Nuki: no |
| Fermax | Smile, Smile Touch | Touch | In development | — |
| Tegui | Serie 7 | Analogue | Compatible | Usually works |
| Tegui | Serie 8, M72 (2-wire) | 2-wire | Compatible | Ring: no (M72) |
| Tegui / Bticino | Classe 100 X16E, Classe 300 | Touch | In development | — |
| Golmar | Nexa, T-line | Analogue | Compatible | Mixed results |
| Golmar | Plus, Uno, G2+ | Bus / 2-wire | Compatible with a physical button | Nuki: no |
| Golmar | ART 7 | Touch screen | In development | — |
| Comelit | Simplebus | 2-wire | Compatible with a physical button | Nuki: no |
| Comelit | Mini hands-free | Touch | In development | — |
| Urmet | 2Voice, 1083, 1122/31 | 2-wire | Compatible | Ring: no (1122/31) |
| Auta | Digital | Digital | Compatible if the button is physical | Nuki: no |
| Any brand | IP monitors, or ones that only open from their own app | IP | Not compatible | — |
Nuki and Ring data taken from their official compatibility lists and forums, checked on 22 October 2026. “Compatible” for SoundKey means the door-release button is a physical push button; we confirm it at every installation.
Guides by brand
Models, how to identify yours and what's worth knowing about each manufacturer (guides in Spanish):
Don't know which model you have?
You don't need to. Just check whether the button goes down. If you want the exact model, it's usually on a sticker inside the cover or on the back of the intercom (you'll need to lift it off the wall).
If you're not sure, join the waitlist and tell us the brand: we'll tell you if it's compatible.
What is a 2-wire intercom?
It's a digital intercom in which every home shares just two cables, carrying the voice, the call and the command to open, encoded by the manufacturer. These are the ones that cause the most trouble for other smart intercom openers. More about 2-wire intercoms.
How do I know how many wires my intercom has?
Open the cover or lift the intercom off its bracket and count the wires going into the terminal block: two wires means a 2-wire system; four or more, an analogue one. For SoundKey it doesn't matter: only the button counts.
What if my intercom is a video intercom?
If the monitor has a physical button to open the door, it works the same way. No need to replace the monitor. More about video intercoms.
Can it damage my intercom?
SoundKey does the same as your finger: it closes the button's contact for a moment. It doesn't inject signals into the building's bus. Its relay comfortably handles the current of even the oldest door releases.