That’s a magnetic sensor to ensure the climate control or heating only works when the window is closed
Inductive contact. May be burglar alarm, heater control etc.
Electric breaker (magnetic). Often used to control for example a kitchen hood, if the flat also has a fireplace, so you don’t accidentally suck combustion gases into the room.
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Looks like alarm sensor.
That’s a magnetic sensor to ensure the climate control or heating only works when the window is closed
Inductive contact. May be burglar alarm, heater control etc.
Electric breaker (magnetic). Often used to control for example a kitchen hood, if the flat also has a fireplace, so you don’t accidentally suck combustion gases into the room.
It usually goes by the name reed switch.
[https://es.wikipedia.org/wiki/Reed_switch](https://es.wikipedia.org/wiki/Reed_switch)
Use cases were mentioned by others comments.
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