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Switch to turn on off 9v device wirelessly

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The dry set of contacts has to trip something to send a sgnal to a battery powered LED.
That wasn't in your original request. There are other solutions, but first do you have any other requirements that you're saving just to surprise us?
 
Thats what I want to know what I can do. I have an alarm cabinet. I would like it to trip a led in another part of the building if the alarm triggers. I can do this if I could run a cable, but due to the construction of the building, I can not get a cable to the locatioon. They do not want wire mold. So what I would like to find out if I could trigger a device using an RB5 relay to send a signsl to smething to turn on a battery operated LED. Sorry I did not explain myself well at all.
 
How far away is the receiver, and what kinds of walls or other obstructions are in the way?


Torben
 
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