<p>AUX+ Bluetooth audio input, HiFi sound quality, high fidelity, high-definition sound quality</p> <p>Subwoofer + left and right channel output</p> <p>External antenna available</p> <p>Four protection mechanisms: anti-reverse connection, overheating, overcurrent, short circuit protection</p> <p>Easily connect your audio system</p> <p>Product name: 2.1 channel Bluetooth audio amplifier module</p> <p>Product model: -MT21</p> <p>Input sensitivity: 500mV</p> <p>Power amplifier chip: domestic power amplifier chip</p> <p>Bluetooth version: 5.0 (unobstructed, 15 meters)</p> <p>Input : AUX+Bluetooth</p> <p>Number of channels: 2.1 channels</p> <p>Protection mechanism: Anti-reverse connection, overheating, overcurrent, short circuit protection</p> <p>Compatible speakers: 20~100W, 4~8Q</p> <p>Adaptable power supply: DC 12~24V\/5A or above (24V battery pack cannot be connected)</p> <p>Output power: left and right channels Less than 50W, subwoofer Less than 100w</p> <p>Tip: Only when the audio input is sufficient and the power supply voltage\/current is sufficient, there will be enough</p> <p>Output power! The higher the power supply voltage, the greater the output power, and the smaller the speaker impedance, the greater the output power!</p> <p>Please that the power of the adapted power supply is the actual working power of the amplifier</p> <p>Colour:Black</p> <p>Material:PCB</p> <p>Package Contents:</p> <p>1 x Upper Cover Plate</p> <p>1 x Lower Cover Plate</p> <p>1 x PCB Plate</p> <p>1 x Screwdriver</p> <p>1 Adapter</p> <p>5 x Buttons</p> <p>4 x M2x16 Copper Posts</p> <p>8 x M2x3mm Screws</p> <p>4 x M2x3+3 Copper Posts</p> <p>Only the above package content, other products are not included.</p> <p>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.</p>