1. Using Wolfson's end WM8804G chip, using I2S interface; support 16-24 audio data formats; distortion and dynamic is very good, tall 192kHz sampling rate support, advanced shake reduction technology can be intrinsic jitter (Intrinsic period jitter) control within 50ps RMS, the high degree of reduction. 2. The use of optical fiber and coaxial outputs two output interfaces, user-friendly external amplifier 3. Support in hardware volume control (I2C interface) 4.The power supply uses Raspberry Pi powered, no external power supply; and the use of π-type filter power supply design can effectively reduce the interference of power supply 5. The use of direct digital output I2S interfaces, reproduction and high non-USB interfaces DAC mode, do not use other extensions GPIO Raspberry Pi Colour:blue Material:PC+metal Package Contents: 1 X HIFI DiGi+ Digital Sound Card I2S SPDIF Optical Fiber RCA Raspberry Pi 2/A+/B+ 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.