This super-sensitive sound-to-light converter incorporates a built-in microphone which captures any ambient sound and lights six high-bright LEDs which react to the different sound levels. It can be used for fun, as a 1 channel sound-to-light unit. or to indicate a telephone ring or doorbell for the hearing impaired. Supply voltage: 9V DC @ 50mA. Includes 9V battery snap. As kit contains solder it may not be available for purchase in California.