Automatic and Autonomous Intruder Alarm.
Whilst searching Google for an autonomous intruder alarm, this post made me laugh out loud… I wrote it:
http://thewildenmarshblog.com/2012/04/23/fool-proof-fully-automatic-autonomous-intruder-alarms-for-sale/
The Wilden Marsh Blog
A nature conservation blog about the fauna and flora of Wilden Marsh Nature Reserve and Site of Special Scientific Interest in the Lower Stour Valley, Worcestershire, England.
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The Romans used the same device.
I’m not surprised, Tom. They are still extremely effective today