KERUI Home Security System Review: Wireless Door / Window Sensor
The KERUI wireless door / window sensor comes in two parts (see photo below). The larger part has the KERUI name on it. It also contains the electronics and the battery. The smaller part is the magnet. The purpose of this sensor is to detect that a door or window has opened. And it does this by sensing the separation of the two parts. When the two parts are separated, the larger unit lights up an LED behind the white plastic, which you can see. Then it sends a signal to the alarm panel.
It is important how you align the two units. Each unit has a small triangle indicate the alignment mark (see photo below). In reality, only the larger unit is non-symmetrical. That means the triangle side on the larger unit has to be pointed toward the smaller unit. The smaller unit on the other hand is practically symmetrical. That means as long as the long side of the smaller unit is against the triangle side of the larger unit, the sensor will work as intended.
These sensors are set up that only when the two unit move apart does the larger unit send a signal to the alarm panel. That means you can open the window/door while the system is disarmed, arm the system, and the system will not fire the siren. When you close the door/window that sensor will arm itself.
This trait has its advantages and disadvantages. The advantage is that you can arm the system even if the doors/windows are open. Then close each of them as you see fit. The disadvantage is that if you forget to close a window/door, you can still arm the system, leave the house, and not know that a door or window is open.
The two unit can be as far apart as 1 cm. Beyond that, the larger unit will not sense the magnet inside the smaller unit.
My KERUI home security system came with ten of these sensors. They were all pre-programmed to zone 1 through 10.
The KERUI Door / Window Sensor is powered by a single 23A battery, which is rated at 12 volts. This is a standard battery used in car remote controls and garage door opener remote controls. When the battery is low, the light indicate will stay for you to see that it is low on battery.
I just gotten the KERUI Home Security System, so I do now know how long the battery will last in these sensors. As I put this system through the test, I will report back on its endurance.
23A batteries are not available as rechargeable batteries. That means over time you will have to replace them with fresh set of batteries. Although a standard battery, it is not inexpensive. Best way to save money in the long run is to buy them in bulk (see "Related Links" below). And you'll likely need to because you'll likely have approximately 10 or so of these KERUI sensors.
Once the KERUI door / window sensor is secured into place, you can slide it upward to separate it from the back panel, revealing the battery compartment (see photo below).
There is no power switch on the door / window sensor. The only way to turn it off is to remove the 23A battery.
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