... selection.5) Easy instillation, no wiring needed, no labour involved. (wireless doorbell)6) Easy mobility, suitable for house, villa, office, hotel ... SIZE(CM)PCS/CTNG.W(KGS)N.W(KGS)QTY/20FTQTY/40GPT-6AC Wireles doorbeel62.8X58.8X58.5602015.9750016200 AC Wireless Doorbell