1. Use high-quality materials, quality guaranteed 2. The PCB circuit board size is reduced, the component layout is more reasonable, and the product service life is increased. 3. The left and right channels use a low-power audiophile-grade dedicated audio chip TDA1517P as the output stage, which truly provides high-quality effects. 4. Stable performance, high-fidelity 2.1 three-channel super bass 12V audio amplifier board 5. Wide range of applications, small size can be easily embedded in various occasions Power supply: DC6.5-15V (depending on the required output power), power adapter, switching power supply, or battery. The recommended current is above 3A. Bass output power: maximum 25W, it is recommended to use a 4-6 inch, 4-6 ohm 20-50W subwoofer Left and right channel output power: 6W+6W, it is recommended to use 2-4 inch, 4-8 ohm, 3-25W full-range speakers The above power requires a power supply of about 13.5V Potentiometer axis distance: 24mm. The diameter of the potentiometer mounting hole needs to be 7mm. Input interface: 3.5mm socket Note:The color of the knob is random and cannot be specified. Colour:Green Material:PCB+components Package Contents: 1 * Amplifier board with Knob Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.