Sound Activated Switch - SODIAL(R) Sound Activated On/Off Switch by Hand Clap 110V Electronic Gadget White Clap to turn on/off lights. Sound sensitivity: more sensitive when turning the dial to HOME, less sensitive when turning the dial to AWAY. The Clapper allows its user to activate one or two appliances using sequences of claps. Two claps, and turn on an appliance which plugs into left receptacle of The Clapper. Three claps, and turn on an appliance which plugs into right receptacle of The Clapper. The clap detection lights will glow with a proper clap or similar sound.