Feature: 1. TPA3116D2 Chip: Using TPA3116D2 digital power amplifier chip as the core, one for parallel bridged bass channel power amplification output, and one for left and right channel power amplification output. 2. Stable Outputs: Can support 100W bass channel, 50W left channel and 50W right channel three channel output, ensuring good sound quality. 3. Better Designs: External audio input interface, with pre amplification, bass crossover processing. There are 5 adjustment potentiometers to control bass volume, bass frequency, left and right channel volume, treble, switch and master volume. 4. Practical Uses: can be used as power supply switch, laptop power supply switch, charging bottle switch, car power supply switch, etc. 5. Efficient Work: Wide operating voltage, power saving design, efficiency as high as 90% or more, easy to install as well. Specification: Item Type: Digital Power Amplifier Material: PCB Function: Power Amplifier Board Chip Model: TPA3116D2 Bluetooth Version: 4.2 Working Voltage Range: DC 12-24V, 3-4A, or 19-24V, 4-5A. If high power is required, 20-24V, 8-9A or more. Bluetooth Receiving Distance: > 8m / 26.25ft, approx. Audio Input Sensitivity: 600-800mV Frequency Response Range: 20Hz-20KHz Left and Right Channel Speaker Impedance: 4-8 ohms Bass Speaker Impedance: 2-8 ohms Product Description: The output power is related to the power supply voltage and current, speaker impedance and the size of the audio input. When the supply voltage and current is sufficient, usually the supply voltage is higher, and the relative output power can be made larger. Speakers with different impedances have different output power. Typically, speakers have less impedance and power is easier to achieve. . Package List: 1 x Digital Power Amplifier Module4 x Washer5 x Nut4 x Screw4 x Brass Standoff5 x Knob1 x Connecting Cable Note: The DC no load voltage should not exceed 25.5V.