1.hotel LED room number plates 2.doorbell function 3.room status display ... -one touch screen electronic doorplate intelligent interlock instructions for “room number”, “hotel name”, "DND", "Please wait", "clean room", "doorbell ... room re-visit rate.7, Hotel electronic doorplate, room number plate of star hotel, three-in-one hotel doorplate, ... , storage temperature range: -20 - 80 LED door number plates