1. Use TPA3255, OPA1632DR 2. The Electrolytic Capacitor Uses A Capacity Of 470uF/100V*4 To Strong And Continuous . 3. The Resistors Use High-Precision Chip Resistors To A Good Signal-To-Noise Ratio Of The Whole Machine. 4. Use A High-Current Magnetic Ring Inductor Specially Designed For Audio To Crisp And Powerful Sound. 5. PCB Uses 1.6mm Thick Double-Sided Board, 2.0 OZ Copper Thickness, And Full Tin Spraying Process To Good Passing Performance Of Large And Small Currents. Top- PCB Quality. 1. Working : Category D 2. Quiescent Current: 65mA 3. Work Efficiency: 88% 4. Output Power: 600w/4 Ohms 10% 5. Frequency Response: 20HZ To 20Khz 6. Dynamic Range: 100 DB 7. Signal-To-Noise Ratio: 100dB(A-Weighted) 8. Working Voltage: DC 48V 9. Pcb Size: About 140x95mm 10.Colour:As Shown 11.Material:PCB Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Package Contents: 1 x Amplifier Board Module 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.