Wireless Alarms and Radio Signal Emissions: Is It Safe?
In this matter, first of all, it is worth comparing the radiation of sensors with the radiation of other radio devices that are part of wireless security systems.
As for sensors, there are quite a few of them and they use different technologies; there are PIR sensors, that is, passive infrared sensors that do not emit anything, because they detect the temperature difference between the rays fixed by a special lens that is placed in front of the pyroelectric element of the device. The same applies to window and door opening sensors or electrical contacts that open like a switch. There are also active infrared barriers that produce low-power infrared radiation only when the system is under protection, and which are completely harmless. Finally, the most common sensors that emit microwaves have very low power, studies show that they are completely harmless.
For wireless systems, it must be understood that items such as sensors, contacts, etc. have a radio that transmits signals to the station; almost all of these systems are unidirectional, meaning that the waves only go from the sensors to the alarm control panel, not the other way around. Peripheral devices thus transmit signals whenever they detect a danger in the controlled area, then the control center decides whether the alarm message should be considered valid or not. This type of peripheral does not have a receiver on board that allows it to know if the alarm is activated or deactivated, so they must always transmit signals, but despite this, the realized power is still very low, around 5 mW.
So, we can conclude that wireless security alarm devices are not harmful to the health of their users.