1. The digital chip adopts wm8804g chip of Wolfson company with 15 interfaces; It is Perfect to support 16 to 24 bit audio data format distortion and dynamics. It supports a large sampling rate of 192Khz. The advanced material reduction technology can control the inherent jitter within 50psrms, and the degree of reduction is very high. 2. Dual clock design is adopted to realize the problem of 44.1KHz and 48Khz sampling rate, restore high-quality audio and improve sound quality 3. The output port adopts optical fiber and coaxial interfaces for output, which is convenient for users to connect external power amplifier, and supports hardware control of volume (I2S interface) 4. The power supply adopts tree power supply without external power supply; The filter power supply is designed to effectively reduce the interference of power supply 5. I2C interface is adopted for direct digital output, with of restoration. Non USB interface DAC mode is adopted, and GPIO interface is reserved for expansion to facilitate expansion Working voltage: 5V Interface: I2S colour: blue Material: PCB Package Contents: 1 x Expansion Board 1 x Screw Pack Only the above package content, other products are not included. Note: Light 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.