Features: 1: High-definition low-distortion HiFi sound quality 2: Heat sink + fan heat dissipation is safe and worry-free 3: TPA3251D2 power amplifier chip design 4: Volume adjustment: high-end encoder knob adjustment, smooth feel 5: Protection mechanism: protection against overvoltage, undervoltage, clipping, short circuit, overheating, etc. Specifications: Product model: XY-S350H Product name: 2.1 channel bluetooth audio power amplifier board Power supply: DC18-38V/10A and above Bluetooth version: 5.1 Audio channel: 2.1 channel Audio input: Bluetooth + AUX + U disk + USB sound card Audio output: left and right channels + subwooferFrequency range: 20HZ-20KHZ Volume adjustment: high-end encoder knob adjustment, smooth feel The left and right channels are up to 220W/3--38VDC output power: 175W/4--38VDC 100W/8--38VDC Subwoofer maximum 355W/2--38VDC Output power: 250W/3--38VDC 195W/4--38VDC Protection mechanism: protection against overvoltage, undervoltage, clipping, short circuit, overheating, etc. Unique function: Support Sinilink-APP to modify the Bluetooth name, set the Bluetooth password, turn off/on the prompt tone Product size: 130mm x 116mm x 27mm Color: Black Material: plastic Package Contents: 1 x Bluetooth 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.