Features: Engineered with a high performances decoding chip, this development board ensures low latency sound processing and plug and play functionality across diverse microcontroller platforms. Perfect for integration in public address systems, vehicle navigation units, and security needing programmable sound module. DFPlayer Mini is inexpensive MP3 module, which can be directly connection to speakers. The module can be used alone with power supply battery, speaker and button, or controlled by serial port, and can be used as a module or any single chip microcomputer with serial port. The module itself integrates the hard decoding of MP3 and WMA. At the same time, the software supports TF card driver and FAT16 and FAT32 file systems. The functions of playing the specified music and how to play the music can be completed by simple serial instructions, without complicated bottom level operations, and it is convenient to use. Specifications: Component: ABS Size: Approx.20mm/0.78inch Package Includes: 3Pcs Development Board note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.