LeaningTech Raspberry Pi HiFi DiGi+ Digital Sound Card I2S SPDIF Optical Fiber Using Wolfson's end WM8804G chip and I2S interface; support 16-24 audio data formats Tall 192kHz sampling rate support, advanced shake reduction technology can be intrinsic jitter (Intrinsic period jitter) control within 50ps RMS. Expansion board designed for Raspberry pi 3 2 Model B/B +. Support in hardware volume control (I2C interface). Raspberry Pi powered, no external power supply; and the use of -type filter power supply design can effectively reduce the interference of power supply.