Video door entry for a building with 4 flats needs three main parts: an entrance panel with a camera and 4 call buttons, a video monitor or an audio door phone in each flat, and a power supply.
With the Comelit BUS system 2 wires are enough, even on old wiring.
What you need for 4 flats

With a QUADRA entrance panel
- QUADRA entrance panel with colour camera, for 1 to 4 calls
- QUADRA power supply with separate outputs for the entrance panel and the indoor devices
- 4 BUS video monitors or audio door phones

With an ULTRA entrance panel
- ULTRA audio/video module with wide-angle camera
- Call push-button module with 4 single buttons
- Frame for 2 modules, surface or flush mounted
- ULTRA 1210A power supply
- 4 BUS video monitors or audio door phones
The push-button module has 4 positions and each position takes a single button (1 call), a double button (2 calls) or a blank cover.

With an ULTRA TOUCH entrance panel
- Entrance panel with 5-inch touch screen and wide-angle camera, calling with virtual buttons or a numeric keypad
- Built-in access control with keypad and RFID
- 1210A power supply, sold separately
- 4 BUS video monitors or audio door phones
The final list of materials depends on the building and the wiring. The partner who carries out the installation confirms the right combination.
Products for a 4-flat system
Video monitors and audio door phones for the flats
Video monitor or audio door phone in each flat
In the Comelit mixed system each of the 4 flats chooses a video monitor with camera or a simple audio door phone, independently of the others. Video monitors with WiFi also send the call to your mobile.
What the cost depends on
- Which entrance panel will be installed and with which modules.
- How many of the 4 flats will have video and how many an audio door phone.
- The condition of the existing wiring.
- Whether there will be entry with a code or card.
- Whether the building has one or more entrances.
Send us these details using the form and we will get back to you.
Frequently asked questions
Is there a ready-made video door entry kit for 4 flats?
On this site the parts of the system are sold separately: entrance panel, modules, power supply and monitors. So the system is built exactly for 4 flats, with the model each one wants.
Does it work with 2 wires?
Yes. The Comelit BUS system needs only 2 wires in good condition from the existing installation, so replacing an old door phone does not require new wiring.
Can I add a flat later?
QUADRA goes up to 4 calls. On ULTRA each push-button module takes up to 8 calls, and the frames hold 1, 2, 3, 4 or 6 modules. If you expect to need more buttons, ask us before you choose.
What is needed if the building has a second entrance?
In buildings with more than one entrance there is an entrance panel at each entrance, together with the audio/video switcher for 2-wire BUS systems, which is powered by the BUS line.
Can a flat have a simple audio door phone?
Yes. In the Comelit mixed system each flat chooses a video monitor or an audio door phone, independently of the others.
What does the cost depend on?
On the entrance panel and its modules, on how many flats will have video and how many an audio door phone, on the condition of the wiring and on whether you want entry with a code or card.
Who carries out the installation?
Installation is carried out by authorised Comelit partners. Find the nearest one on the partner map.
Ask us about a system for 4 flats
Tell us whether the building has one or more entrances and what wiring is there today. We will get back to you as soon as possible.