A duress function lets residents open the door with a code and at the same time send a signal to the concierge that there's a problem.
胁迫功能可以让住户用密码打开门的同时发送一个信号给门房。
A duress function lets residents open the door with a code and at the same time send a signal to the concierge that there's a problem.
胁迫功能可以让住户用密码打开门的同时发送一个信号给门房。
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