Product model: XY-S220H Power supply: above DC12-38V/10A Bluetooth-compatible version: 5.1 Audio channel: 2.1 channels Audio input: Bluetooth-compatible + AUX + USB flash disk + USB sound card<br><br>Audio output: left and right channels + subwoofer Frequency range: 20Hz -- 20KHz Volume adjustment: high-end encoder knob adjustment, smooth feel Maximum output power of left and right channels: 180W/3 ohm--36VDC 80W/8 ohm--36VDC Maximum output power of subwoofer: 220W/3 ohm--36VDC 160W/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 / on prompt tone Colour: black Material: plastic Size: about 134x126x26mm<br><br>Package Contents: 1 * Bluetooth power amplifier board module<br><br>Only the above package content, other products are not included. Note: Light shooting 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.