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There are many such buttons on Tmall, and it is recommended to use the button of the mouthy cat brand, wireless FM technology, and the distance is long.
It's very simple, you can buy a wireless switch, about 150 meters or so, if you have a network, you can also buy a network smart switch.
There are two wires for the hand alarm in the hotel bathroom, which can be directly connected to the terminal on the hand report. This thing is linked to the fire department, and the address code is also encoded.
Panic button alarms in the bathroom are generally connected to the property.
There are student residences.
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Whether the grounding wire is connected or not depends on whether the electrical appliance used is a metal shell. Or if there is a leakage, it will hurt people. If there is no possibility of leakage, grounding is not required.