Support serial port, have the ports and function of router I2S and LED, can be pilot run and be demo board.
It build in DAC IC and audio I/O port, can be mass product for wifi speaker
The reserved port of S/PDIF digital audio, provide a convenient way for high-quality wifi audio design
A mini USB port to be connected to your laptop or power adapter for power supply, no need to buy new power adapter.
This module can be used in different wifi product such as 3G router, repeater, USB wireless storage, wifi speaker, IOT, etc.

Product Specifications
Solution
Qualcomm AR9331
Wireless Standards
802.11b,IEEE 802.11g,IEEE802.11n
Max transmission rate
150Mbps
DAC Output
sampling rate at 48kHz/24bit 
Push Access Protocol
Support DLNA\\AirPlay\\Qplay
Decoding Formats
Support APE\\MP3\\Flac\\AAC\\WMA\\ALAC,etc.
Antenna Type
Built-in High Gain Antenna
GPIO NO.
20
ROM
NOR FLASH,8MB
RAM
DDR2,64MB
Dimension
45*25mm
Temperature
0 ~ 40℃(Work ),-20 ~ 70℃(Storage )