[TPA3251 HIFI chip] TPA3251 chip solution: Stereo 2.1 channel output, ensuring continuous serial high power operation, wide voltage input DC: 12-38V, this power amplifier board uses two TPA3251 high fidelity maximum output power, up to 220W x 2+350W. [Multiple Input Methods]S350HS has multiple input methods, such as Bluetooth input, AUX input and USB drive input. Most devices such as mobile phones, , laptops, etc. can be used, connected and used. [Treble and Bass Control]If you are tired of amplifiers with only one volume knob, then you feel right because you have further requirements for your audio. By adjusting the high and low frequency knobs on the S350HS power amplifier board, you can make the sound more layered and the bass more punchy. [Protection Function]The S350HS Bluetooth power amplifier board has a variety of protection mechanisms to its safe operation. With short circuit protection, overcurrent, overheating and anti-reverse protection. When an overload occurs, the device reports the fault condition to the processor to protect itself from damage Material: plastic colour: Black Package Contents: 1 x Bluetooth Amplifier Board 1 x Screwdriver 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.