1.Bell Function; DO NOT DISTURB , MAKE UP,PLEASE WAIT, Room ... 3.Apply for hotel Product feature:"DND" " Make up" "bell" " please wait" indicator. Dark back light to make visible ... show "DND","clean room" and "bell", very personalized, for easy indoor and outdoor communication.Electric doorplate, three-in-one doorbell, ... doorbell system/ hotel room control panel/electrical hotel bell/door chime/door ...