Guitar Dual Channel Operational Amplifier Preamp Acoustic Guitar Processor 2 Channels Preamp System for Acoustic Folk Guitar Electric Guitar Ukulele Features: It is an independent two-channel four-stage equalization preamplifier that can adjust low, medium, high, and super high pitches. With independent output and mixed output, designed for passive patch, passive sound hole, and tail nail pickup. The PA-2 can amplify or reduce the signal at will and allows you to accurately adjust to the sound you want. The PA-2 can be inserted into two instruments at the same time and can be independently adjusted. You can select independent output or mix output to the speaker. Suitable for all musical instruments with a 6.35mm interface, such as acoustic folk guitar, electric guitar, ukulele, etc. Specifications: Color: Silver Material: Metal Power Supply: 9V, 100mA Battery(not included) Item Size: 14.5 * 8.5 * 6cm/ 5.7 * 3.3 * 2.4in Item Weight: 365g/ 12.9oz Package Size: 17.5 * 11 * 7cm/ 6.9 * 4.3 * 2.8in Package Weight: 515g/ 18.2oz Package List: 1 * Preamp 1 * User's Manual Guitar,Dual,Channel,Operational,Amplifier,Preamp,Acoustic,Processor,2,Channels