Da Buzzer is a qr code doorbell.1.
Sign up with an e-mail address2.
Download and print your QR code3.
Affix your QR at your desired location (gate or door).
4.
A visitor can now scan your QR code,and ring.4.
You receive a notification on "Da Buzzer" app on your phone
https://andro.io/app/dabuzzerandroid
Power 100
Android app profile
Da Buzzer for Android – Latest Version & Features
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> 2.2k
Monthly Downloads
~$900
Estimated Cost
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