1、Preamplifier: This preamplifier board can condition the incoming audios signal before sending to the power amplifier board 2、Intelligent Design: The preamplifier module adopts dual 5532 chips, which has good working stability and high efficiency 3、Easy to Use: Preamplifier module is compatible with 2.54mm and 5.08mm connectors, and which the output is DC12V 4、Good Control: Preamplifier module adopts continuous adjustment of treble, midrange, bass and volume, is very simple 5、Simple Installation: This tones board comes with M3 mounting holes, which is easy to install and can be completed quickly in a few minutes Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.