Smart switch 1:room no. 2:waiting 3:D.N.D 4:Bell 5: Clean Name: Smart switch1: Size:86*86mm2: Suit for 110V/220V,12V/5V.3: It can show:Room number,Waiting,D.N.D,Bell,Clean.4: Used outside the room.5: Packing:100pcs/carton.Carton size: 47*24*38CM.Unique design,it is very popular in hotels. Smart switch,touch screen switch,hotel switch