Description: POWERFUL CHIP: The amplifier board adopts powerful chip, the output power to 50Wx2, stereo dual channel output to ensure continuous serial high power operation, AUX audio input, has a 3.5mm AUX audio input interface, suitable for speakers 15-100W, 4~8Ω. TREBLE AND BASS ADJUSTMENT: This audio power amplifier board with treble and bass adjustment buttons,you can directly adjust the treble and bass through the module, By adjusting the high and low frequent knobs, you can make the sound more layered and make the bass more shocking. PROTECTIVE FUNCTION: This power amplifier board has overheating, overcurrent, short circuit protection multiple protections to ensure its operate, with case to protective it. HIGH COMPATIBILITY: Audio amp board is suitable for power supply DC9~24V/3A or above, 24V pack cannot be connected, the DC adapters on the market basically can meet the needs of the ZK-502MT power amplifier board. we have also included a DC conversion plug in the product. EASY INSTALLATION: Each Audio 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: ABS PP Size: 89mmx60mmx21mm/3.50inchx2.36inchx0.83inch Model: ZK-502MT Signal to noise ratio: >90dB Input method: AUX Number of channels: Left and Right double channels (Stereo) Adapted Speaker: 15-100W, 4~8Ω Adapted Power supply: DC9~24V/3A or above (24V pack cannot be connected) Voltage: 12V-8Ω/12W+12W, 4Ω/20W+20W 15V-8Ω/18W+18W, 4Ω/30W+30W 19V-8Ω/30W+30W, 4Ω/40W+40W 24V-8Ω/40W+40W, 4 Ω/50W+50W Package Includes: 1Pcs Power Amplifier Board Note: Please allow slightly errors due to manual measurement and different monitors.