This is a simple - easy to build - cellphone controlled switch. A five second call - from anywhere in the World - will toggle the switch On and Off.

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Cellphone Operated Toggle Switch
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This is a photograph of the Cellphone Operated Toggle Switch. A simple five second call - from anywhere in the world - will energize or de-energize the relay. And since the call is never actually answered - it will probably be free.
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Image Magnifier Courtesy Of DynamicDrive.Com

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