Features 1、100% brand new and high quality. 2、Small body and stable performance. 3、The PCB is a powerless dimming plate, the principle is that the audio signal is filtered directly through the blocking element to achieve the desired high and low sound. 4、Its main function is to make the input audio signal high-pitched or bass adjustment, and then the adjusted signal will be amplified by the amplifier board. 5、Suitable for audio, etc, Specification Features: 1. 100% brand new and high quality 2. Small body and stable performance. 3. The PCB is a powerless dimming plate, the principle is that the audio signal is filtered directly through the blocking element to achieve the desired high and low sound. 4. Its main function is to make the input audio signal high-pitched or bass adjustment, and then the adjusted signal will be amplified by the amplifier board. 5. Suitable for audio, etc, Specification: Condition: 100% Brand New Adjustable Items: Total Volume, High Volume, Low Volume Channel: 3 Channels Knob Spacing: 22.5mm Socket: XH2.54 3P Weight: Approx. 28g / 1.0oz Package List: 1 * Pre-Amplifier Module Package List