Specifications: Input Voltage: DC 3.2~5.0V 24 -bit DAC output, support for dynamic range 90dB , SNR support 85dB Fully supports FAT16 , FAT32 file system, maximum support 32G of the TF card, support 32G of U disk, 64M bytes NORFLASH Advertising sound waiting function, the music can be suspended. when advertising is over in the music continue to play Audio data sorted by folder, supports up to 100 folders, every folder can hold up to 255 songs 30 level adjustable volume, 6 -level EQ adjustable Control Mode: 1) Serial ModeSupport for asynchronous serial communication mode via PC serial sending commands Communication Standard:9600 bpsData bits :1Checkout :noneFlow Control :none2) AD KEY ModeWe use the AD module keys, instead of the traditional method of matrix keyboard connection, it is to take advantage of increasingly powerful MCU AD functionality, Our module default configuration 2 AD port, 20 key resistance distribution.3) I/O Mode Application: A: Car navigation voice broadcast B: Multi-channel voice alarm or voice guidance equipment operation C: Electric sightseeing bus safety with voice announcement D: Electrical and mechanical equipment failure alarm E: Fire alarm voice prompts F: Automatic broadcast equipment, regular broadcast The DFPlayer Mini MP3 Player For Arduino is a small and low price MP3 module with an simplified 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 . Package Included: 3 x DFPlayer Mini MP3 Player Module