[TPA3251 HIFI Chip] The TPA3251 chip solution s stereo 2.1 channel output, supporting continuous high-power operation with wide voltage input DC: 12-38V. This power amplifier board features dual TPA3251 high-fidelity amplifiers for a maximum output power of up to 220W x 2 + 350W. [Multiple Input Options] The S350HS offers multiple input methods including Bluetooth, AUX, and USB drive input. Compatible with most devices such as smartphones, laptops, and other audio sources, it allows easy connection and operation. [Treble and Bass Control] Move beyond basic amplifiers with only a volume knob. The S350HS power amplifier board includes adjustable high and low frequency controls, allowing you to enhance sound depth, add richness, and achieve punchier bass. [Protection Features] The S350HS Bluetooth power amplifier board includes multiple protection mechanisms for reliable performance. Features include short circuit protection, overcurrent protection, overheating protection, and reverse polarity protection. In case of overload, the system automatically detects and reports fault s to prevent harm. Material: Plastic Color: Black Package Contents: 1 x Bluetooth Amplifier Board 1 x Screwdriver Other items not included.