Traditional Culture Encyclopedia - Hotel franchise - Elevator car expansion, three blue buttons. Turn it up.

Elevator car expansion, three blue buttons. Turn it up.

Neither is allowed. According to the display of the elevator booth, these three blue buttons are: alarm button, call button and fault maintenance button. Elevator car extension is an extension in elevator intercom system, which is installed in elevator car. When the elevator is in trouble, it can ask the management center for help.