Power output: Left and right channels less than equal 220W, subwoofer less than equal 350W Voltage gain: 30dB Adaptive power supply: DC16-38V, greater than equal 10A Compatible speaker: Left and right channels 30-200W, 3-8Ω;Subwoofer 30-350W, 2-8Ω Protection mechanism: Anti reverse connection, undervoltage, overheating, overcurrent, short circuit protection (can be automatically restored without restarting) Product name: 2.1 Channel BT audio amplifier module Product model: ZK-AS1 2G Input method: AUX+ BT+USB flash drive+ USB sound card (Dial wheel button to switch modes and songs) Power amplifier chip: TPA3255 BT version: 5.1 Audio output: 2.1 channels (Left channel+ Right channel+ Subwoofer) Switch mode: Mechanical switch (no need to long press and wait) Tip:Only when the audio signal input is large enough and the power supply voltage/current is large enough, will there be sufficient output power!The higher the power supply voltage, the greater the output power, and the smaller the speaker impedance, the greater the output power!Please ensure that the power of the adapter is greater than the actual working power of the amplifier! Due to different batches, there may be differences in product appearance, color, and printed text, which will not affect the use. Color:As Shown Material:PCB Package Contents: 1 * Bluetooth Power Amplifier Module(without shell)