DFPlayer Mini is a compact and inexpensive MP3 module that can be connected directly to the speaker. Module can be used alone with battery power supply, speaker and keypad, or through the serial port control, as the Arduino UNO or any microcontroller with a serial port module. The module itself perfectly integrated hardware decode MP3, WAV, WMA's. While the software supports TF card driver to support FAT16, FAT32 file system. Can be done by simple serial command plays the specified music, as well as how to play music and other functions, easy to use, stable and reliable!