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Is it time to ring the alarm on internet door cameras?
(www.theguardian.com)
This is a most excellent place for technology news and articles.
I use a specialised hammer-and-anvil system that produces an audible notification whenever someone use it.
I get stakeholders in the me-visiting community to self-empower their activity through user induced notification media
I tie a toy chicken to a wall that when honked, creates an audible sound.
I have a sign that says "Shout to enter".