Voice Changer Electrical Engineering Kit with Circuit Diagram (No Soldering Required)The Voice Changer Kit includes a solderless breadboard, components, and circuit diagram that you can use to build your own voice changer. Once assembled, it enables the user to change the tone of his her voice. The tone frequency in the circuit can be adjusted up or down to affect the tone change in one's voice. Requires jumper wire for assembly and one 9V battery for operation. Note: Step by step instructions are not included use the included parts