A single camera above the front door does not make a security system. A real system starts with three questions: what exactly do you want to see, at what time of day, and from where will you be watching? Many buyers spend a serious amount of money and then discover weeks later that the footage was already overwritten, or that the face of the person standing at the gate is nothing but a dark blur because the lens is pointed straight at the street light. In this guide we break a surveillance system into its four parts — the recorder, the cameras, the power supply and the network — set out practical criteria to choose by, and walk through devices that are genuinely in stock for homes and shops.
How to choose a surveillance system
- Decide on the system type first: network cameras (IP) run over a network cable and record to an NVR, while analogue cameras (Turbo HD) run over coaxial cable and record to a DVR. Mixing the two up is the single most expensive mistake in this field.
- Channel count: buy a recorder with two channels more than the number of cameras you own today, because expanding later is far cheaper than replacing the whole unit.
- Resolution: 4MP (2560x1440) is plenty for entrances and corridors, 6MP gives cleaner detail when you zoom in, and 4K (3840x2160) suits wide open areas.
- Lens angle: a 2.8 mm lens is wider and fits rooms and nearby doorways, while a 3.6 mm lens is narrower but resolves detail at a greater distance.
- Night vision: infrared produces a black and white image, whereas white or hybrid light keeps colour at night, and the colour of a car or a jacket is evidence that no amount of resolution can replace.
- Retention time: it depends on drive size, camera count, resolution and compression, and H.265 compression produces much smaller files than H.264, which stretches retention on the same disk.
- Audio and deterrence: a camera with a microphone, a speaker and a siren lets you warn an intruder out loud instead of merely recording him.
- Power and internet: put the recorder and the router on a backup power source, and remember that watching from outside the house depends on your upload speed, not your download speed.
Hikvision DS-7616NXI-K2(D) — 16-channel network recorder
An NVR that takes sixteen IP cameras at up to 4K and accepts two hard drives, which means double the retention without dropping quality. Its AcuSense technology tells people and vehicles apart from swaying branches and animals, so you get far fewer false alerts of the kind that make most owners switch notifications off for good. A sensible choice for a large shop or a house with many cameras.
Hikvision DS-7604NXI-K1 — 4-channel network recorder
The compact member of the same family: four channels, one hard drive, and 4K support. It fits the average home that needs a camera at the door, one in the yard, one in the hallway and a fourth in reserve. Its smaller size and lower power draw are a real advantage where mains power cuts out often.
HIKVISION DS-2CD1043G2-LIU — 4MP outdoor camera with audio
An outdoor IP camera at 4MP with a 2.8 mm lens, a built-in microphone and Smart Hybrid Light, which combines infrared with white light so it can hold on to colour at night when you need it. A good fit for a front door, a shop facade or a garage entrance.
HIKVISION DS-2CD1163G2-LIU — 6MP indoor dome camera
An indoor dome camera at 6MP with audio and a 2.8 mm lens that covers a wide angle from the corner of a room. The higher resolution pays off precisely when you enlarge part of the frame to read a small detail, such as what happens at the checkout or on the shelves.
HIKVISION IDS-7204HUHI-M1/XT — 4-channel DVR
If you already have old analogue cameras and coaxial cable buried in the walls, swapping the recorder alone is far cheaper than rewiring the building. This is a four-channel DVR supporting 8MP resolution with a single hard drive bay, and it upgrades a legacy system in one step.
HIKVISION DS-2CE78U0T-LXTS — 4K camera with two-way audio and siren
An analogue camera at 4K with a 3.6 mm lens, two-way audio and an alarm siren, so you can speak to whoever is standing in the yard or trigger a warning sound from your phone. It connects to a DVR, not an NVR, so keep that in mind before you buy.
TP-Link Tapo C320WS — 2K outdoor Wi-Fi camera
A practical answer when running cable is difficult: it joins your Wi-Fi network, records to an internal microSD card, and delivers colour night vision at 2K. It suits a roof, a side entrance or a small storeroom, as long as a strong Wi-Fi signal actually reaches it.
HIKVISION DS-2CFSP4/4G — solar pan-and-tilt camera with a 4G SIM
The answer for places with neither mains power nor internet: a solar panel, a built-in battery and a 4G SIM that sends the image straight to your phone. The camera pans and tilts at 4MP with a 2.8 mm lens, so a single unit covers a wide perimeter. Ideal for an orchard, a construction site or a gate far from the building.
Common mistakes when installing a security system
- Buying cameras before choosing the recorder: you end up holding an IP camera with an analogue recorder sitting on the shelf.
- Forgetting the hard drive: many recorders ship without one, and an ordinary desktop drive is not built for the round-the-clock writing that a surveillance-grade drive handles.
- Mounting the camera too high: you end up filming the tops of heads instead of faces, while a sensible height keeps the face inside the frame rather than above it.
- Pointing the lens at a light source: midday sun or a street lamp turns everyone standing in front of it into a black silhouette.
- Leaving the default password: a recorder exposed to the internet with a well-known password turns from protection into a vulnerability.
- Ignoring backup power: when the power cuts out recording stops completely, and that is usually the exact moment you need the footage.
Frequently asked questions
How many cameras do I need for a home or a shop?
The practical rule is one camera per entrance or exit, one per open area you want to see in full, and one over the till in a shop. An average house is well covered by four cameras, and a small shop usually needs four to eight. What matters far more than the count is that the angles are thought through.
How many days of footage does the recorder keep?
There is no fixed number, because retention shifts with camera count, resolution, frame rate, compression type and drive size. Once the disk fills up, the recorder begins overwriting the oldest footage automatically. If you want a longer window, increase drive capacity or switch to motion-triggered recording instead of continuous recording.
Can I watch the cameras from my phone while I am away?
Yes, through the manufacturer's app once the recorder is connected to the internet. The quality of remote viewing depends on the upload speed of your subscription, not the download speed. If the connection is weak, watch the lower-resolution sub-stream live and leave the high-resolution recording stored on the disk.
What is the difference between an NVR and a DVR?
An NVR takes network (IP) cameras over a network cable, while a DVR takes analogue cameras over coaxial cable, and an IP camera will not work on a DVR or the other way round. If you are starting from scratch, an IP system is the better route; if the old cabling is already in the walls, a DVR saves you the rewiring.
Do the cameras keep working during a power or internet outage?
Losing the internet only stops remote viewing; recording to the disk carries on as long as there is power. Losing power stops everything, which is why it is worth putting the recorder and the router on a backup power source that covers the length of the outage.
Do I need a technician to install it?
Wi-Fi cameras you can mount and configure yourself in a few minutes. A full NVR or DVR system, on the other hand, needs cable runs, wall mounting and network configuration, and it is better handled by a qualified technician so you avoid wiring mistakes that are hard to undo later.
The practical takeaway
Start on paper, not in the shop: sketch a simple plan of the house or the store, mark every entrance and sensitive spot, then count the cameras and settle on the system type. After that pick the recorder that matches the channel count, then the outdoor and indoor cameras, and finally solve the awkward spots with a Wi-Fi camera or a solar camera with a 4G SIM. Every device listed here is in stock with delivery to all Iraqi provinces and cash on delivery, so you receive it first and pay afterwards. The best system is not the most expensive one; it is the one that gives you a clear picture at the moment you actually need it.
