Supported Sampling Rates (kHz): 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48; 24-bit output, dynamic range up to 90 dB, SNR up to 85 dB. The DFPlayer integrates a hardware decoding module supporting common audio formats including MP3, WAV, and WMA. Supports FAT16 and FAT32 file systems; compatible with microSD cards up to 32 GB and USB drives up to 32 GB; includes 64 MB NOR Flash memory. Control modes: I/O control, UART serial control, and analog button control. Playback of specific audio files is enabled via simple UART commands—no complex firmware programming required. The DFPlayer Mini MP3 Player is a compact, cost-effective MP3 module with direct speaker-level audio output. It can operate as a standalone device with battery, speaker, and push buttons—or integrate with microcontrollers (e.g., Arduino, Raspberry Pi) or any device with UART RX/TX capability. Input Voltage: DC 3.2–5.0 V. Supports pause/resume functionality: audio playback pauses during announcement mode and resumes automatically afterward. Audio files can be organized in folders; supports up to 100 folders, with up to 255 files per folder. Typical applications include: 1. In-vehicle navigation voice prompts 2. Multi-channel alarm or guidance systems 3. Electric sightseeing bus safety announcements 4. Equipment status or fault alerts 5. Fire alarm voice notifications 6. Scheduled or automated broadcast systems Material: PCB Color: Black Package Contents: 5 × DFPlayer Mini MP3 Player Boards Note: Color appearance may vary slightly due to screen settings and lighting conditions. Dimensions are subject to a tolerance of ±1–3 cm.