Product model: XY-S220H Power supply: above DC12-38V or 10A Bluetooth-compatible version: 5.1 Audio channel: 2.1 channels Audio input: Bluetooth-compatible and AUX and USB flash disk and USB sound card Audio output: left and right channels and subwoofer Frequency range: 20Hz - 20KHz Volume adjustment: high-end encoder knob adjustment, smooth feel Maximum output power of left and right channels: 180W or 3 ohm- 36VDC 80W or 8 ohm- 36VDC Maximum output power of subwoofer: 220W or 3 ohm- 36VDC 160W or 4 ohm-36VDC Protection mechanism: overvoltage, undervoltage, clipping, short circuit, overheating and other protection Unique functions: support sinlink app, modify Bluetooth-compatible name, set Bluetooth-compatible password, and turn off or on prompt tone Colour: black Material: plastic Size: about 134x126x26mm Package Contents: 1 x Bluetooth power amplifier board module Only the above package content, other products are not included. Note: Light 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.