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It's a smoke detector, and if it's on fire, it's going to call the police, and it's something that can be monitored on the roof.
Isn't this stuff copy
This is called the alarm button, the effect is, when someone at home suddenly feels uncomfortable, they can't move, they want to rescue urgently, they need someone to help, you can press this life-saving button, and your community network, but don't usually press it, otherwise people don't believe it, something really happens, and people don't come to the door. >>>More
Is it a gas alarm? Usually it's installed in the kitchen.
This is a double detector in the burglar alarm system. It is used to detect whether there is a person in the hall.
The simple top is so high, make a suspended ceiling.
If the landlord doesn't care about you and you don't want to leave the place, the easiest way is to prepare some old newspapers and paste it up! The method is not complicated, make a few skeletons on the roll of paper tubes, fix them with thumbtacks, and then brush the newspaper with paste or milky white glue, and then paste them layer by layer You feel that the strength is enough! I hope you will adopt!