Product name: 2.1 channel Bluetooth audio amplifier board Model: -S350H Bluetooth version: 5.1 Frequency range: 20Hz-20KHz Signal to noise ratio: 92dB Power supply: above DC18-38V/10A Audio channel: 2.1 channel Audio output: left and right channels+subwoofer Audio input: Bluetooth+AUX+U disk+USB sound card Output power: 220W * 2 (left and right channels)+350W (subwoofer) Maximum output power of left and right channels: 220W/3ohm 2-36V DC 175W/4ohm 2-36V DC 100W/8ohm 2-36V DC Maximum output power of subwoofer: 355W/2ohm-36V DC 250W/3ohm-36V DC 195W/4ohm-36V DC Subwoofer (subwoofer) adaptive speaker: 20W-200W/2 ohm - 8 ohm Volume adjustment: high-end encoder knob adjustment, smooth feel Protection mechanism: overvoltage, undervoltage, overheating, wave clipping, short circuit, etc Special function: support Audio APP control Product size: 133 x 130 x 25mm Colour:black Material:PCB+Metal Package Contents: 1 x 2.1 channel power amplifier board 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.