1. This is a special HIFI DAC expansion board designed for the for Raspberry pi B+ , using TI's DAC chip (PCM5122), using an I2S interface. 2. The user can use this expansion board with audio playback systems (for volumio, for xbmc system etc.) to build its own network HIFI player. 3. The expansion board provides two kinds of output interfaces to facilitate external amplifiers and other equipment. 4. It provides LED indicates working status. Red LED for the DAC power indicator (Power normal light), the green LED for the DAC working condition (when working decode light, stop, or does not work when off), a better understanding of the work of the DAC provide infrared receiver interface (occupied GPIO26). Sampling Frequency: 384KHz Resolution (Bits): 16-32 Digital Audio Interface: I2S SNR: 120dB THD: -93dB Dynamic range: 112dB Supports for Raspberry Pi B+, for Raspberry Pi 2 Model B Colour:Black Material:plastic Package Contents: 1 x Audio Sound Card 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.