Features: Integrated software and mute function adjust computer simultaneously, improving signal to noise and sound quality. External sound card avoids electromagnetic interferences in the chasses, ensuring clear sound output. Power by USB, connect directly to earphones, or use as a pre-stage for enhances sound experience. PCM2704 is a monolithic digital to analog conversion chip. It have two digital-to-analog conversion output channel and integrated USB controller. PCM2704 can receive 16bit sound data with sampling rates of 48KHz, 44KHz and 32KHz. Specifications: Component:Plastic Size: Approx.5.8cm/2.28inch Package Includes: 1Pc Decorder Board note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.