Main parameters: Power supply: DC 6.5-15V (depending on the required output power), power adapter, switch mode power supply, battery can be used, and it is recommended to use a current of 3A or above. 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: 6Wand6W, it is recommended to use a 2-4 inch, 4-8 ohm, and 3-25W full frequency speaker. The above power requires a power supply of around 13.5V. The left and right channels use the low-power audiophile grade audio dedicated chip TDA1517P as the output stage, truly providing high-quality effects. PCB material: FR-4 fiberglass board, thickness: 1.6mm. Board size: 63x45x20mm (length x width x height), excluding potentiometer handle length. Potentiometer axis distance: 24mm. The diameter of the potentiometer mounting hole needs to be 7mm. Input interface: 3.5mm socket. Packaging includes 1 x Power amplifier board 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.