The Clapper was a popular gadget in the 80's and 90's. It let you turn appliances on and off just by clapping. This can be pretty useful, but it has some limitations. First there is the problem of loud noises accidentally turning the lights off. Also, you can't control multiple outlets independently...By: DIY Hacks and How Tos
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from Instructables: exploring - technology http://www.instructables.com/id/Sound-Activated-Outlet/
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