Out door wireless alarm

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Joined
22 May 2004
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1,792
Location
N.Ireland
Hi guys

I am looking for a wireless alarm that I can set at a part of my house. I am looking one with a straight beam so that if anything breaks that beam an alarm will go off in the house. Were would I get some thing like that?

Will be placed between 2 walls so want one with just a straight beam so that if anyone breaks the beam the alarm goes off.

Gareth
 
I remember there being a build your own kit version of these, basically sent an IR beam from a transmitter to a reciever.

It was in a store like that guy from spoooks ben caplin.

(note this was many years ago)
 
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