1. TPA3116*2, NE55322. Four 1000UF/25V electrolytic capacitors are used as filter capacitors.3. The PCB is made of 1.6mm thick double-sided plates, 2.0 amperes copper thick, and the whole process of tin spraying to the good passing performance of and small currents. First class PCB quality.4. Shielded amplifier special inductor is used to clear and powerful sound.5. The potentiometer adopts high-quality fully sealed potentiometer, which has better dust-proof effect and is more durable From left to right potentiometer: treble volumeBasic parameters:Working mode: Class DStatic current: 50mAWork efficiency: 90%Rated output : 2*100WFrequency response: 20Hz-20KHzWorking voltage: DC18V-DC24Vcolor:BlackMaterial:PCB+MetalPackage Contents:1 x amplifier boardOnly 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.