$10
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Original price is $35~. More details can be found at:
http://www.amazon.com/Clapper-Sound-Activated-Switch-Each/dp/B0000CGKLR
Clapper is in perfect condition. The clapper has two plugs, one that reacts to 2 claps and one to 3 claps. As long as your claps are spaced evenly with a short pause, the clapper will recognize it. Please look at Amazon's product description for more detail.
It has been really easy to use - connected light equipment to it for fun. Price is firm.
Please do not message this poster about other commercial services.