This is the dfplayer a compact and cheap mp3 module. The module can be directly connected to the speaker. This module can be used with battery power, speaker and keyboard. Or via a serial port control such as that of the Arduino Uno . The module decodes MP3, WAV, WMAs. While the software supports a TF card driver to support FAT16, FAT32 file system. It can also be done by a simple serial command. The module is easy to use, stable and reliable.