Technical Specifications: 1 supports sampling rates (KHz): 8 / 11.025 / 12/16 / 22.05 / 24/32 / 44.1 / 48 224-bit DAC output support dynamic range: 90dB SNR support: 85dB 3 fully supports FAT16 FAT32 file system maximum support 32G TF card support U disk to 32G 64M bytes NORFLASH 4 a variety of control modes are available. IO control serial port AD button control mode 5 radio spots language function you can pause the background music being played. Advertising finished playing background sound continues to play back 6 the audio data is sorted by folder supports up to 100 folders folders can be assigned to every 255 Tracks 730 level adjustable volume six adjustable EQ Application: 1 car navigation voice broadcast 2 road transport inspectors toll stations voice prompts 3 train bus safety inspection voice prompts 4 electricity communications financial operating room voice prompts 5 vehicles into and out of the channel to verify the voice prompts 6. ** frontier channel voice prompts 7 multi-channel voice alarm or voice guidance equipment operation 8 electric sightseeing bus safety with voice announcement 9 electrical and mechanical equipment failure alarm 10 fire alarm voice prompts 11 automatic broadcast equipment regular broadcast Package included: 1 x DFPlayer Mini MP3 Player Module For Arduino0