Who is that at the door?
Not at home? Not able to open the door right now? Let the persons outside either get in direct touch with you or leave a message.
Is there noone at home? Or maybe they're too busy to get to the door in time?
Touch the doorbell
Using an NFC-enabled phone or a QR code scanner app the person outside can tell that he/she is there.
By using the doorbl app a notification will pop up telling who's at the door. You can easily start a conversation with the person at the door without having to get to the door.
By taking advantage of NFC, QR codes and the fact that everyone carries around their mobile device, you can now answer the door even when you're not at home or are unable to come to the door. This is the doorbell of the future.
Using doorbl is free and no expensive hardware or installation is needed.