Powered by dual sources, the tone board adopts enthusiast-grade op amp NE5532, made by patch technology, small size design, AC and DC dual use. Working voltage: AC dual 10V-17v or DC dual 13-24V Board size: 100mm x 45mm (excluding the protruding part of the potentiometer) Overall height of the board: about 23mm 4 potentiometer spacing: 25mm (fixed potentiometer version) Type: Fixed Version Colour: Black Material: plastic Package Contents: 1 x Amplifier Board Note: Separate version of the potentiometer connection wires (two connection wires of the same potentiometer) cannot be exchanged at will, otherwise it will work abnormally. Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.