1. All Parts Of This Product Are And Authentic, And Of Pure Quality; Using High- Not Only Ensures Safety And Quality, And Has A Long Service Life, But More Importantly, It Is A Strong That The Actual Performance Can Meet The Design Goals. 2. Use The Disassembled Sanken Tube 2SA1216 2SC2922N Operational Amplifier Op07 3. The Front Adopts Direct Coupling Amplification, And The Entire Circuit Has No Coupling Capacitor, Which Reduces The Distortion To 0.01%. 4. The Resistors Are Made Of High-Precision Resistors, And The Main Circuit Uses High-Precision Resistors With An Accuracy Of 1%, Ensuring A Good Signal-To-Noise Ratio Of The Whole Machine. 5. The PCB Uses 1.6mm Thick Double-Sided Sheets, 2.0 Oz Copper Thickness, And Full Tin Spraying Process To Good Passing Performance Of Large And Small Currents. First-Class Pcb Quality, First-Class Production Technology. This Board Can Be Debugged Into Category A, B Or Category A. The Sound Quality Is Soft, Pleasant And Powerful, Comparable To The Lm3886. Description: 1. Voltage: -30V~48V 2. Power: 150W 3. PCB Size: About 142 x 72mm (Length*Width) 4. Communication Interface: 5. Power Supply Current: 10A Material: PCB colour: As shown Package Contents: 1 Amplifier Board Module 1 Set x Screw Installation Package Accessories 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.