... LED indicator on receiver2) Anti interference technology used. (digital coding)3) 35 different musics can be chosen by ... .5) Easy instillation, no wiring needed, no labour involved. (wireless doorbell)6) Easy mobility, suitable for house, villa, office, hotel, ... )QTY/20FTQTY/40GPA4-C1(C2).AC wireless doorbeel53.5X38X55.96013.811.11440030960A4-C4AC wireless doorbeel62.8x58.8x58.56019.315.3750016200 ...