kuman for Raspberry Pi HIFI DiGi+ Digital Sound Card I2S SPDIF Optical Fiber for Raspberry pi 3 2 model B B+ SC07 Expansion board designed for Raspberry pi 3 2 Model B B + The user can cooperate audio player system to set up their own network HIFI player after using HIFI DiGi+ board Detailed tutorials including project introduction CAN BE PROVIDED FOR FREE,contact us BY Email to get documents.