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Battery powered Motion sensor + Radio transmitter

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Battery powered Motion sensor + Radio transmitter

Postby scr08 » Sat Feb 25, 2012 11:19 am

I need a portable device capable of alerting me from a distance of 150-200 yards when it is trigger. It will be watching a door / doorway. Budget is $50. My ideas: Motion sensor + Radio transmitter. Who can help?
scr08
 
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