Short answer
If the building is under construction or renovation and running cable is easy, a wired alarm needs less maintenance and its sensors have no batteries. In a finished home you live in, or if you are a tenant, a wireless system is installed without breaking walls. In many places the most sensible option is a hybrid installation, where the panel accepts both wired and wireless sensors.
How does a wired alarm work?
In a wired system, each sensor is connected to the alarm panel with its own cable. The panel is the main box that the sensors and siren connect to and that manages the system. Because the cable carries both power and signal, the sensor has no battery. When the power goes out, the backup battery inside the panel keeps the system running.
The cables run through conduits under the plaster or through a surface-mounted cable duct. In a building that is newly built or being renovated, if this is planned at the same time as the electrical installation, no trace is left on the wall. In a lived-in, painted home, either the duct stays visible or the wall has to be opened. In shops and offices with suspended ceilings, cable runs easily above the ceiling, which is why wired installation is common in businesses.
How does a wireless alarm work?
A wireless sensor communicates with the panel by radio signal and runs on its own battery. Sensors are fixed with screws or double-sided tape. In an apartment, installation is usually finished the same day, with no dust or debris.
The biggest difference among wireless systems is the direction of communication. In a two-way system, the panel polls each sensor at set intervals. If a sensor does not answer or its battery gets weak, the panel gives a warning. In cheap one-way systems, when a sensor goes silent the panel may not notice, and that room is left unprotected without anyone knowing. When you ask for a quote, ask whether the system supervises its sensors. If you are a tenant, a wireless system has one more advantage: when you move, you can take the sensors down and reuse them with the same panel in the new home.
Which is more secure?
When installed correctly, both work reliably; their weak points are different. In a wired system, if someone cuts the cable, the panel detects it as tampering. For this, the installation must be done with a tamper line; ask the installer about it.
In a wireless system, the risk is deliberate disruption of the signal. This is called signal jamming. Quality panels can raise a warning when they detect prolonged interference. The real difference shows up in use: a wireless sensor whose battery has run out does not protect that point until you replace the battery. The panel gives a warning, but it is up to you to see the warning and replace the battery.
In old stone houses in Şanlıurfa, thick walls can weaken the radio signal. In such a building, before installing a wireless system, the signal strength each sensor gets to the panel should be measured during installation.
Expert note: If the panel of a wireless system has a screen or app menu that shows signal strength, check each sensor's value after installation. A sensor working at the limit can lose its connection when a door closes or furniture gets in the way.
Which is suitable by building type?
The decision is mostly made according to the condition of the building. The pairings below summarize the situations we meet most often in the field.
- Rough construction or renovation: wired or hybrid; plan the cable routes now.
- Lived-in apartment and tenants: wireless; the system can be taken down and moved to the new home.
- Large detached house, garden and outbuildings: hybrid; wireless sensors for the far points.
- Shop, office and warehouse: mostly wired; a suspended ceiling makes the job easier.
- Old building with thick stone walls: wireless or partly wired, depending on the signal measurement.
What does the cost depend on?
In a wired system the sensor itself is cheaper but cable, conduit and labor costs are added. A wireless sensor has a higher device price and less labor. Over the years, battery replacement is also counted in a wireless system.
In both systems the factors that really determine the total are the same: how many doors and windows will be protected, how many rooms will get a motion sensor, whether the siren will be indoors or on the exterior, and whether the alarm will notify you by phone or over the internet. An exact figure comes only with an on-site inspection and a written quote.
There is also a time cost. A wired installation can take a few days depending on how hard the cable route is, and may need paint or plaster touch-ups at home. In a wireless installation the home is hardly disturbed at all. In a business where you cannot close the shop, this difference also affects the decision; wired work can be planned outside working hours or on a closed day.
Expert note: When asking for a quote, ask in writing for the number of sensors and where each sensor will be fitted. Two quotes using the same panel can look very different because one includes six sensors and the other ten.
What should you check on installation day?
Whichever system you choose, test every sensor one by one before the installer leaves. Open the door, open the window, walk through the room, and see that the panel or the phone app shows the right zone name. If the screen says zone 4 when the living room sensor is triggered, you will not know where to look when the alarm sounds at night.
In a wired system, ask for the cables to be labeled on the panel side. Years later, when a sensor fails, these labels make finding which cable goes where a matter of minutes. In a wireless system, note the battery type used and where to find spare batteries. Some sensors use special batteries that are not sold in supermarkets.
Finally, listen to the siren. An indoor siren deters inside the home; an outdoor siren alerts the neighbors. The outdoor siren should be in a rain- and sun-resistant housing, at a height that hands cannot easily reach.
Why is a hybrid panel often the best choice?
A hybrid panel has a wireless receiver next to its wired sensor inputs. Points where running cable is easy, such as the entrance door and the living room, are protected with cable; far points such as the balcony, the garage or the storeroom in the garden are protected with wireless sensors. When you want to add a room later, you do not need to open the walls.
In a home where a wired alarm was installed in the past, if the cables are sound they are not pulled again. The panel is replaced with a hybrid model, the existing cables are used, and the missing points are completed with wireless. The decision is made by testing the condition of the cables on site.
In an on-site inspection, Desa Bilişim walks through the building and marks one by one which point will work better with cable and which with a wireless sensor. The quote is prepared according to this list.
Frequently asked
How long does the battery of a wireless alarm sensor last?
The time varies with the manufacturer, the sensor type and how heavily it is used. A sensor in a busy corridor runs out sooner than a window contact that is rarely opened. Good panels warn in advance when the battery gets weak; when you see the warning, you only need to replace the battery.
Does the alarm keep working when the power goes out?
Yes, if the panel has a backup battery. How long the battery lasts depends on the number of sensors, the siren and the age of the battery. The battery weakens over the years, so it must be tested during maintenance.
Can wireless sensors be added to a wired alarm later?
They can if the panel supports a wireless receiver or a receiver module can be added later. If it does not, the panel is replaced and the existing cables continue to be used. The decision is made by looking at the panel's model.
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