This MP3 module is a small and low cost MP3 module with an amplifier output directly to the speaker. The module can be used as a stand alone module with attached battery, speaker and push buttons or used in combination with an Arduino UNO or any other with RX/TX capabilities. Feature: 24 -bit DAC output, support for dynamic range 90dB , SNR support 85dB Fully supports FAT16 , FAT32 file system A variety of control modes, I/O control mode, serial mode, AD button control mode Advertising sound bites, sound effects Audio data sorted by folder, supports up to 255 folders, each folder can hold up to 1000 songs 30 level adjustable volume, 6 -level EQ adjustable.