The smart video doorbell for you in case someone will come to your door, so he will scan your QR code using the nekinsan app or any G-pay or Paytm scanner and after that he will be able to connect you by video call. And in case If you don't have internet, it automatically switches to an audio call connecting simultaneously through a virtual number to protect your privacy. This doorbell sticker has no need for any wire, electricity to use this sticker, It's the perfect smart video doorbell for homes and offices.