1. Using TDA7498E 2. The Power Supply Filter Capacitor Uses 2200uf/35v And Capacitors 3. The Main Electrolytic Capacitor Signal Circuit Adopts Taiwan Famous , And The Capacitor Adopts Sanying Electrolytic Capacitors To Strong And Continuous . 4. The Resistor Is A Five-Ring Metal Resistor, And The Main Circuit Is A Precision Chip Resistor, 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. Working Method:Category D Quiescent Current:50mA Work Efficiency:90% Rated Output Power:2x100W Frequency Response:20HZ To 20KHZ Working Voltage:DC20V To DC32V (Recommended DC24V Internal + External -) Maximum Output Current:3A Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Not Affect The Use Colour:Black Material:ABS Package Contents: 1 * Digital Power Amplifier 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.