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wireless electronic device Answered

i am looking to build a device that can communicate with a phone and through that phone you could turn on or off a light or a siren with fairly long range 20 to 30 meters (60 to 90 feet). Would anyone be able to help regarding this device. I am looking for it be as small as possible. also i wanted this device to run with fairly low voltage dc power source.

please help with this 

thanks

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bernie308 (author)2012-10-20