Here (the UK), you can buy outdoor motion sensor lights /with/ a
built-in wireless link to an annunciator/alarm (that comes with the lamp
You can also get CCTV cameras with sensors that automatically change
channels on your TV and/or sound an alarm when activated. So you can see
what* it is that has arrived.
*In my case, the "what" would probably be large and hairy and answer to
the name of,"Baaaaaa".
This isn't quite what you asked about but might be an alternative:
It's a trail monitoring system used by hunters.
Have you looked at wireless driveway alarms?
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