Open the building door with your phone
With the intercom you already have, including 2-wire and video intercoms.
SoundKey is a device that connects to the intercom you already have (analogue, 2-wire or video intercom) and opens the building door when someone rings: because you switched it on from your phone, or because it's a booking's arrival day. No building work and no need to replace the intercom.
- 2-wire and video intercoms
- Battery powered, no socket
- No need to replace the intercom
- Airbnb and Booking reservations
Three steps, and the door only opens when you want it to
Connect it to your intercom
Two wires to the door-release button on your intercom handset, with no building work and no new equipment. SoundKey sits right next to it, in its own case.
Choose when it opens
Switch it on from your phone for the next few hours, or link it to your Airbnb and Booking reservations so it only opens on arrival day.
They ring, the door opens
When someone rings at the street door, SoundKey hears the buzzer and presses the door-release button. The rest of the time, it opens for nobody.
Everything from your phone, nothing to install
See the status of each door, your reservations and who has come in. And send anyone you want to let in a link: they don't need an account or an app.
If your door-release button goes down when you press it, SoundKey can press it
Other smart intercom openers mimic the intercom's electrical signals, and every 2-wire brand uses its own protocol. SoundKey doesn't mimic anything: it presses your button. That's why it also works where the others can't.
| Intercom type | SoundKey |
|---|---|
| Analogue (4+n wires) | Compatible |
| Digital 2-wire | Compatible |
| Video intercom with buttons | Compatible |
| Touch button or touch screen | In development |
Built for holiday lets, handy at home too
Airbnb and Booking hosts →
Self check-in at the building door too. Import your reservations via iCal and it only opens when your guest rings, on their arrival day. No meeting anyone, no leaving keys.
At home
Let in a delivery driver, family or whoever looks after your elderly relatives, even when you're out. Send them a link with the days and hours you choose, or switch the door on from your phone for the next few hours.
SoundKey vs Nuki Opener, Ring Intercom and Raixer
| SoundKey | Nuki Opener | Ring Intercom | Raixer Mini | |
|---|---|---|---|---|
| How it opens | Presses your door-release button | Mimics the intercom's signals | Mimics the intercom's signals | Connects to the intercom |
| 2-wire intercoms | Yes, with a physical button | Many not (Fermax Duox, Comelit Simplebus…) | Many not (Tegui M72, Urmet…) | Depends on the model |
| Power | Rechargeable battery (USB-C) | 4 AAA batteries | Rechargeable battery | Mains socket |
| Remote opening | Included (WiFi) | With Nuki Bridge (€99) | Included (WiFi) | Included |
| Airbnb / Booking reservations | Included (iCal and API) | Smart Hosting, €69/year | No | Yes |
| Price | Planned: €0 + €10/month | €129 | €79.99 audio · €99.99 video | €79 + €99.90/year (excl. VAT) |
Prices and compatibility checked on each manufacturer's official website and forums on 22 October 2026. They may change. Nuki, Ring and Raixer are trademarks of their respective owners.
The device is free. You only pay for the service
It's not on sale yet and the price may change. The idea is that you don't have to risk anything to try it on your intercom.
Device included. 12-month minimum term.
- SoundKey with its case and rechargeable battery
- App to open the door and see who has come in
- Guest links, no app needed
- Airbnb and Booking reservations via iCal, plus an API
- Updates over WiFi
- Free for the first year: the GoToCheck.pro Premium plan, with online check-in, guest registration sent to SES.Hospedajes and virtual keys (€7.45/month + VAT)
What people ask us most
How do I know if my intercom is compatible?
Press the door-release button on the intercom in your flat. If it's a button that goes down (a physical push button), SoundKey can press it, whatever the brand and however many wires it has. If it's a touch button, compatibility is in development. See the full guide.
Does it open for anyone who rings?
No. It only opens when you've switched it on from your phone, or during a booking's arrival window. The rest of the time the buzzer rings as usual and nothing happens.
Do I need building work or a new intercom?
No. You open the cover of the intercom in your flat and connect two wires to the door-release button; on some models they need to be soldered. The intercom keeps working exactly as before.
How long does the battery last?
It has a rechargeable lithium battery and charges over USB-C, like a phone. We're measuring real battery life on devices in everyday use and will publish the figures once testing is finished. The app warns you when the battery is low.
Want to try it on your intercom?
Join the waitlist, tell us which intercom you have and we'll let you know when units are available.