We have optimized the line, and the anti-noise ability has been greatly increased. The sound is clear and identifiable, very quiet, without impact, and the sound is clean and without noise! The sound quality is good, great and loud! Compared with the previous model, this one has a larger heat sink and capacitor, which releases strong power! Advantages: The materials are excellent, the product structure is simple, the classic power amplifier circuit is used, the sound effect is good, the speaker is not picky, and most audio sets are common, and you can easily bring it with a 50W transformer! The best choice for ordinary DIY players, without too much modification, pure power amplifier board, the structure is simple and easy for the player to modify - supports the signal access of the tuning board for tuning Pay attention to the insulation treatment of the heat sink during the renovation and installation, and the motherboard wiring must not be connected incorrectly, otherwise it will burn out immediately. Pay attention to safety inspections before powering on. Power amplifier chip: LM1875 X 2 Maximum output: 2X30W Working power supply: dual power transformer 11V-18V 50W-80W can be Acceptable load: 20W-80W speaker, 4ohm-8ohm Motherboard size: 97mm x 84mm x 47mm Heat sink size: 75 x 21 x 45mm Motherboard hole distance: long distance 71.5mm-short distance 31mm general M3 screw hole colour:Black Material:plastic Package Contents: 1 x Amplifier board set Only the above package content, other products are not included. Note: Light shooting 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.