Smart Wireless Doorbell Ring Door Chime Home Door Intelligent Smart Bell Calling ringbell (Color : 1Button 1Receiver, Size : U/S)

5. Battery type transmitter” USE a 23A12V alkaline battery (not included battery in the shipment).
Non-battery type transmitter—-NO battery is needed..
7.The wireless signal will be affected by obstacles. The more obstacles, the more signal loss.
8.ReceNOTE:The button cannot be placed on an iron door because it will interfere with the signal.
Dear buyer, Hello! Welcome to our shop, we are a professional manufacturer of door chimes. We operate in good faith and do every part with high quality. If you have any questions during the shopping process, please feel free to consult me.