Asked: Portable Wireless Alarm System?

They do work, but make sure you get some background and confirmation about the system you buy. I am retired now but was a fire alarm engineer, I had to condemn a wireless system in a school, because the signal from the devices were not strong enough to "talk" to the main panel. Admittedly this was because of both distance and thick walls so you may not have that problem in a flat. Just be aware that they are battery operated, where the units need to be accessible for you to change the batteries when needed.

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