No rewiring, reduced installation time, improved efficiency – perfectly suited for renovation and retrofit markets.

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Introduction

In security projects, time is cost, and cabling is a pain point. This is especially true for old buildings, heritage properties, or already decorated homes – cutting new channels not only damages the interior but also significantly increases labour and material expenses.

Our 2-wire video intercom system is designed to solve this exact problem. It uses existing two-core cables (even old telephone lines or existing weak-current conduits) to simultaneously transmit video, audio, unlock signals, and power. No rewiring needed, installation time reduced by more than 50%, and project efficiency greatly improved.

Whether you are a system integrator, security contractor, or property manager, this system will become your go‑to solution in the renovation and retrofit market.

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1. No Rewiring – Protect Decorations and Lower Costs

Traditional video intercom systems often require dedicated multi‑core cables (4 cores or more) with strict specifications. For already occupied homes or fully decorated office buildings, rewiring means:

• Damaged walls and ceiling finishes
• Added labour for channelling, conduit laying, and restoration
• Longer construction periods, disrupting residents’ daily lives

Our 2-wire system uses non‑polarity two‑wire technology. With just two ordinary wires of 0.5mm² or more (existing intercom wires, telephone lines, or even good‑quality two‑core power cables), it simultaneously transmits:

• HD video signal
• Two‑way audio signal
• Unlock control signal
• Device power

What this means for you:
You can upgrade an old analog system to a modern video intercom without damaging any decorations. For historic buildings, high‑end finished residences, hotel renovations, etc., this is an irreplaceable advantage.

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2. Reduced Installation Time – Faster Delivery, More Profit

Time is money. In engineering projects, cabling typically accounts for 30%–50% of the total construction period. With a 2-wire system, installation steps are simplified to:

1. Verify that the existing two‑core wires in the conduits are in good condition (or reuse existing cables).
2. Connect the door station, indoor monitor, and power supply according to the wiring diagram (no need to distinguish polarity).
3. Power on and test.

Compared to traditional 4-wire or IP network systems, you do not need to:

• Test wire order and polarity
• Run separate power cables
• Configure complex network switches or IP addresses

Real‑life example:
A contractor took on a retrofit project for an old community with 48 apartments. Originally planned to use a 4-wire system with an estimated 15 days of work. Switching to our 2-wire system, the actual installation took only 6 days, labour costs were reduced by over 60%, and there were zero complaints from residents (almost no drilling or wall damage).

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3. Improved Efficiency – One Installation, Long‑Term Stability

Beyond installation efficiency, the 2-wire system also delivers efficiency in maintenance and expansion:

• Simple troubleshooting – Fewer wires mean faults are easier to locate.
• Supports multiple devices in series – One indoor monitor can be connected in series with up to 4 additional indoor monitors or 2 door stations (with a 2-wire switch).
• Plug and play – Indoor monitors automatically recognise door station calls, no complicated address code settings.
• Compatible with mainstream electric locks – Directly controls electric strikes, magnetic locks, motor locks, etc., without additional relay modules.

For property managers, this means lower operating costs and faster response times.

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4. Perfectly Suited for Renovation and Retrofit Markets

Around the world, a large number of residential and commercial buildings have outdated or failing intercom systems. Homeowners and property managers want to upgrade to modern features like video intercom and mobile app remote control, but they do not want to damage their decorations.

Our 2-wire system is tailor‑made for exactly these retrofit projects:

Retrofit Scenario	2-Wire Solution
Old community intercom upgrade	Use existing two‑core wires, replace door stations and indoor monitors – achieve video intercom
Hotel room system renovation	No rewiring, fast installation, minimise room downtime
Office building access control retrofit	Use existing weak‑current conduits, add remote unlocking and mobile app control
Villa garden gate intercom	Use buried two‑core conduits to easily achieve long‑distance intercom (up to 100 metres)

Real‑life applications:

• A high‑end apartment in Shanghai: Built in 2005, the original audio intercom system frequently failed. The property wanted to upgrade to video intercom, but residents objected to damaging the decoration. Using our 2-wire system and the existing wiring, we completed the upgrade of 24 units in just 2 days, with very high resident satisfaction.
• A hotel in Spain: 80 guest rooms needed to add doorbell video functionality. Using 2-wire indoor monitors and the existing telephone lines, each room took less than 30 minutes to install. The hotel completed the renovation without closing down.

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5. Why Choose Us?

• Direct factory – Own R&D and production, quality controlled, competitive pricing.
• Rich product line – 7‑inch and 10.1‑inch indoor monitors available, supporting touchscreens, IPS glass screens, Linux, Tuya app, etc.
• OEM / ODM support – Customise logo, interface, language, and housing colour to meet project needs.
• Apoio técnico – On‑site or remote installation guidance, problem solving.
• Global track record – Products already serving renovation and retrofit projects in more than 60 countries and regions.

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Upgrade Your Projects Today

If you are looking for a no‑rewiring, fast‑to‑install, stable and reliable video intercom system, our 2-wire solution is the best choice. Whether it is old community renovation, hotel refurbishment, or office access control upgrades, we can provide you with cost‑effective products and professional support.

📧 Contact us now for catalogue & quotation.
🌐 Visit our website: www.farhd.com

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