[LINK] Knock, knock

[Tom Worthington]

On 17/12/15 16:31, Roger Clarke wrote:

> ... Skybell ("Answer your door with a smartphone") ...

Assuming caller has a smart phone, wouldn't a QR Code on the door be 
sufficient? The caller would scan the code with their smart phone to 
contact you.

Perhaps the QR Code could be 3D printed into piece of hinged brass, 
which the caller could raise and release as a backup door notification 
device: an e-knocker? ;-)


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Tom Worthington FACS CP, TomW Communications Pty Ltd. t: 0419496150
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