Description: Power Amplifier Board Specifications: Power Amplifier Board Output power to 50W+50W+100W, AUX audio input, 2.1 channel stereo output, ensure continuous serial high power operation, suitable for power supply DC12-24V/5A or above (24V pack cannot be connected), suitable for speakers 20~100W, 4~8Ω. HIFI Stereo: The audio power amplifier module with powerful chip, shielding power inductance, low noise front stage operational amplifier, let you enjoy a more perfect sound quality experience. Treble and Bass Adjustment: This digital Amp board with independent treble and bass adjustment buttons,you can directly adjust the treble and bass through the module, By adjusting the high and low frequency knobs, you can make the sound more layered and make the bass more shocking. Protective Function: This power amplifier board has multiple protection to ensure its operation, with case to protective it. Easy Installation: Each Audio Power Amplifier Board interface illustration is printed on the protective plate, easy to install and use even without instructions. Small size and portable, easy to carry. Specification: Material: Electronic Components ZK-MT21:93mmx90mmx22mm/3.66inchx3.54inchx0.87inch ZK-TB21:118mmx110mmx22mm/4.65inchx4.33inchx0.87inch Input sensitivity: 500mV Input method: AUX Number of channels: 2.1 channels Adapted speaker: 20~100W, 4~8Ω power supply: DC12~24V/5A or above (24V pack cannot be connected) Output power: left and right channels