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Addresses the demonstration

Addresses the demonstration

[Abstract]:
System characteristic of the doorbell switch rooms, in addition to the visitor has the function of the bell, do not disturb, please namely cleaning

System characteristic of the doorbell switch rooms, in addition to the visitor has the function of the bell, do not disturb, please namely cleaning, please wait outside display function, and also for special room for the guests, the hotel receptionist, indicator light instructions, for guests to provide comfort and convenience.