Power output: Left and right channels less than equal 220W, subwoofer less than equal 350W Voltage gain: 30dB Adaptive power supply: DC16-38V, 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: -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 and wait) Tip:Only when the audio signal input is large enough and the power supply voltage/current is large enough, 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 that the power of the adapter is the actual working power of the amplifier! Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Color:As Shown Material:PCB Package Contents: 1 * Bluetooth Power Amplifier Module(without shell) Only the above package content, other products are not included. 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.