Features Stable Control: The continuous adjustment of the amplifier sound module adopts high sound, medium, bass and volume, which is very simple and convenient to meet our control needs. Intelligent Design: The front placing module uses a dual 5532 chip, which has good work stability and efficiency. It is a practical electronic accessories board. Front Amplifier Board: Previously placed large -scale board can be adjusted to the audio signal before sending the power amplifier board, simple, convenient and practical. Easy -to -Use: The amplifier front plate module can be compatible with 2.54mm and 5.08mm connector, and the output is DC12V, which is easy to use. M3 Installation Hole: The soundtrack has a M3 installation hole. The hole is easy to install and can be quickly installed and connected in a few minutes. Specification: Item Type: NE5532 Preamplifier Chip Model: NE5532x278M12x1 Input Voltage: DC 12-25V AC 9-18V Architecture: Dual 5532 High, Medium and Low 3 Stage Continuously Adjustable Features: DC12V Output Input Interface: Approx. 2.54mm / 0.10in interface, Approx. 5.08mm / 0.20in Terminal Output Interface: Approx. 2.54mm / 0.10in interface, Approx. 5.08mm / 0.20in Terminal Adjustment Type: Treble + Midrange + Bass + Total volume Mounting Hole: M3 (Diameter: Approx. 3.3mm / 0.13in) Material: PCB Package List: 1 x Volume Control Board 16 x Accessories Package List 1 x Volume Control Board 16 x Accessories