Feature:1. Preamplifier: This preamplifier board can condition the incoming audios signal before sending to the power amplifier board2. Intelligent Design: The preamplifier module adopts dual 5532 chips, which has good working stability and high efficiency3. Easy to Use: Preamplifier module is compatible with 2.54mm and 5.08mm connectors, and which the output is DC12V4. Good Control: Preamplifier module adopts continuous adjustment of treble, midrange, bass and volume, is very simple5. Simple Installation: This tones board comes with M3 mounting holes, which is easy to install and can be completed quickly in a few minutesSpecification:Item Type: NE5532 PreamplifierChip Model: NE5532x278M12x1Input Voltage: DC 12-25V AC 9-18VArchitecture: Dual 5532 High, Medium and Low 3 Stage Continuously AdjustableFeatures: DC12V OutputInput Interface: Approx. 2.54mm / 0.10in interface, Approx. 5.08mm / 0.20in TerminalOutput Interface: Approx. 2.54mm / 0.10in interface, Approx. 5.08mm / 0.20in TerminalAdjustment Type: Treble + Midrange + Bass + Total volumeMounting Hole: M3 (Diameter: Approx. 3.3mm / 0.13in)Material: PCB.Package List:1 x Volume Control Board16 x Accessories