The Clapper is a sound-activated electrical switch, sold since 1984 by San Francisco, California based Joseph Enterprises, Inc. Robert E. Clapper, Sr., and Richard J. Pirong marketed the clapper with the slogan "Clap On! Clap Off! The Clapper!". The Clapper plugs into a U.S.-type electrical outlet, and allows control of up to two devices plugged into the Clapper. An upgraded model, known as the Clapper Plus, includes a remote control function in addition to the original sound-based activation.
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