Powered by dual power 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) / The separated version of the potentiometer is easy to install and is not limited by the distance between the casings. The shielded wire is connected and will not cause interference problems. The two op amps are equipped with gold-plated round hole sockets. If you feel that the op amp is not enough to have a fever, you can easily replace a better op amp chip by yourself. The 4 potentiometers of the separated version may be 4 pieces together when shipped, just go back and remove them by yourself. Type: Fixed Version / Separated Version Colour: Black Material: plastic<br><br> 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 shooting 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.