Video Door Phone Buying Guide: Wired vs Wi-Fi, Monitor Size and Gate Unlocking
Quick answer: A video door phone lets you see and talk to a visitor from inside your home or office and, on most systems, release the door or gate lock with one button. Choose a wired system if you want a reliable, always-on setup for a villa, apartment or office. Choose a Wi-Fi (app-based) system if you want to answer from your phone when you are away. A 7-inch monitor suits most homes; larger or multiple monitors suit big houses and offices.
This guide answers the questions buyers ask most often: how a video door phone works, wired versus Wi-Fi, which monitor size to pick, how it unlocks a gate or door, and what to check before you order.
What is a video door phone and how does it work?
A video door phone has an outdoor camera unit fixed near the door or gate and one or more indoor monitors. When a visitor presses the call button, the monitor rings and shows the visitor. You can talk to them through the built-in speaker and microphone. Most systems also have an unlock output, which sends a signal to an electric lock so you can open the door without walking to it.
An audio door phone works the same way without a camera. It costs less and is useful where you only need to speak to the visitor. If you want to see who is outside, choose video.
Wired vs Wi-Fi video door phone: which is better?
| Point | Wired video door phone | Wi-Fi video doorbell / app-based |
|---|---|---|
| Connection | Cable between outdoor unit and monitor | Connects to your Wi-Fi router |
| Reliability | Does not depend on internet | Depends on Wi-Fi signal and internet for app features |
| Remote answering | Usually inside the building only | Answer from a mobile app when away |
| Installation | Needs cable laying, best planned at construction or renovation | Easier to fit on an existing door |
| Best for | Villas, offices, apartments, gates far from the house | Rented flats, quick upgrades, remote monitoring |
If your outdoor unit is more than a few metres from the router, Wi-Fi may be unstable. In that case, a wired system, or a Wi-Fi extender, is the safer choice. Always check the maximum cable length given on the product page for wired models.
Which monitor size should you choose?
- Smaller monitors are neat for flats and small offices where the monitor sits near the entrance.
- 7-inch monitors are a popular choice for homes because the visitor's face is clearly visible from a normal viewing distance.
- Larger or multiple indoor monitors help in multi-storey homes and offices, where you want to answer from more than one floor.
Also check whether the monitor is wall-mounted or desk-mounted, and whether it supports touch buttons or physical buttons. Many people prefer physical buttons for elderly family members.
How does a video door phone unlock a door or gate?
The video door phone does not unlock anything by itself. It sends an unlock signal to a separate lock. Typical combinations are:
- Electric strike or motorised lock on a house door.
- Electromagnetic (EM) lock on a glass or metal door. Our EM lock buying guide explains sizes and brackets.
- Gate lock or gate motor on a main gate. See our main gate electronic lock guide and sliding gate motor guide.
Make sure the lock's power supply is separate from, or properly rated for, the door phone. A lock that needs a stronger current than the door phone's output supplies must be driven through a relay or a dedicated power supply. For help matching parts, see our door access control systems guide.
What to check before you buy
- Number of entry points. One door, or a door plus a gate? Some systems support more than one outdoor unit.
- Number of indoor monitors. Confirm the system can add extra monitors if you need them.
- Cable run. Measure the distance from the outdoor unit to each monitor and check the cable type recommended in the product details.
- Weather protection. The outdoor unit sits outside. Check its weather-resistance rating on the product page, and fit a hood if it is exposed to rain.
- Night viewing. Look for night vision or lighting if your entrance is dark.
- Lock compatibility. Confirm the unlock output and the lock type you plan to use.
- Power. Confirm the power supply, and plan a backup if power cuts are frequent in your area.
Video door phone options at NavKar
NavKar Systems lists audio door phones, video door phones from established brands, Wi-Fi video doorbells and smart locks with built-in doorbell functions. Browse the full range in Video Door Phones. If you also want the door to open by fingerprint, card or PIN, see Digital Locks.
Frequently asked questions
Can a video door phone open my gate?
Yes, if the gate has an electric lock or gate motor that can take an unlock or trigger signal. The door phone sends the signal, and the lock or motor does the opening. Confirm compatibility before buying.
Do I need internet for a video door phone?
A wired video door phone works without internet. A Wi-Fi model needs a working router for the app, remote viewing and remote answering.
Can I add more monitors later?
Many systems allow extra indoor monitors, but the number depends on the model. Check the product details for the maximum number of monitors before you buy.
Is audio enough, or should I choose video?
Audio is enough if you recognise visitors by voice and want a lower-cost option. Video is better for homes and offices where you want to see who is at the door before you open it.
Video door phone for different places
| Place | What to prioritise | Suggested approach |
|---|---|---|
| Independent house or villa | Gate-to-house distance, weather protection | Wired system with outdoor unit at the gate and monitor inside |
| Apartment | Door-side viewing, no major wiring | Wi-Fi video doorbell or a compact wired unit |
| Office | Reception control, multiple monitors | Wired system with a monitor at reception and lock release |
| Shop or clinic | Back door or after-hours entry | Door phone with a lock release for staff |
| Housing society | Many flats, guard communication | Intercom or EPABX-based system; see our society gate security guide |
Installation steps in simple terms
- Decide the positions. Mark where the outdoor unit and each monitor will sit. The outdoor unit should be at about face height and protected from rain.
- Plan the cable route. Use conduit where possible. Keep low-voltage cable separate from mains cable.
- Fit the lock. Install the electric lock or gate trigger and test it on its own first.
- Connect the power supply. Use a supply that suits the monitor and the lock. For power supply sizing, see our access control power supply guide.
- Test the full system. Check video, sound, lock release and the call button before closing walls or boxes.
Troubleshooting common problems
- No picture: Check the cable joints and the power at the outdoor unit.
- Poor sound or echo: Adjust volume settings and keep the speaker and microphone from facing hard surfaces directly.
- Lock does not release: Check that the lock has its own correct power and that the door phone's output is wired as the manual shows.
- Wi-Fi model disconnects: Move the router closer or add an extender, and keep the camera within a good signal area.
- Night picture is dark: Clean the lens and add a light near the entrance.
More questions buyers ask
What is the difference between a video door phone and a video doorbell?
A video door phone usually has a separate indoor monitor and often a lock release. A video doorbell is a compact camera-doorbell that sends video to your phone, and may or may not include a lock release.
Can two monitors show the same visitor?
Many multi-monitor systems let several monitors ring and show the visitor at the same time. Check the product details for the number of monitors supported.
Can I record visitors?
Some models record images or video to a memory card or the cloud, while others only show live video. Confirm this feature before you buy if you need records.
Shop Video Door Phones at NavKar Systems
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