Feature: 1. Adopts I2S interface; Support 16 to 24 bit audio format; Ideal distortion and dynamics, support high sampling rate up to 192 kHz, advanced jitter reduction technology for inherent jitter control in 50 RMS. 2. Integrated IR receiving function, it is more convenient to control playback without network. 3. The expansion board provides two convenient output interfaces of optical fiber (S/PDIF) and coaxial (RCA) for external amplifiers and other devices. 4. Adopts π power type filter to effectively reduce power interference. 5. Direct digital output using I2S interface, highly restored, no need for USB interface DAC mode, no need to occupy for Raspberry plus extension GPIO. 6. Provide power indicator for easy observation of the status expansion board. 7. Fiber optic interface uses HIFI grade fiber seat, coaxial interface uses Pluse audio input isolation; Transformer and good digital audio to protect your audio equipment and motherboard at the same time 8. The PCB board adopt gold-plating process, ensuring better signal continuity impedance and reducing reflection and refraction of the signal. Specification: Item Name: For Raspberry Pi 3/2B HIFI DiGi Digital Sound Card I2S SPDIF Expansion Board Fiber Optic Module Sampling Rate: 192kHz Supported Audio Format: 16-24 bit . Package List: 1 x SPDIF Expansion Board