Jrifedptry -ST21 Bluetooth Power Amplifier Board 2.1Channel 100W+100W+200W Subwoofer TPA3221 Digital Power Amplifier Module, Easy to Use

2. Thickened heat sink, silent and long-life fan; Solved the heat dissipation problem and better utilized the advantages of high power 1. High current, low magnetic loss, small parasitic capacitance, low heat generation, use of oxygen free copper wire to improve sound quality; The magnetic shielding mechanism has strong anti electromagnetic interference performance. 3. Transparent sound, fast low-frequency response, strong mid frequency texture, high frequency smoothness, and minimal loss 4. Extremely low noise, quality, extremely low distortion, protecting your sound experience 5. Protection mechanism: Input undervoltage, overheating, overcurrent, short circuit protection. No input anti reverse protection, positive and negative poles cannot be reversed!