The computing end uses the replaceable DIP-8 op amp x2, and buyers can upgrade the computing model independently. This product uses 2 TI high-performance audio operational amplifiers NE5532PThe main filter electrolytic capacitor adopts Nichicon capacity 2200UF/63V x 2, 6 Nichicon FW series 10UF golden audio input coupling capacitors. Other filter capacitors use Nichicon series.Adopt SAGAMI 7W14A inductor for audio digital class D amplifier to the sound is clear and powerful.colour: as shownMaterial: electronic componentsPackage Contents:1 x Digital 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.