3.3-5.2VDC power supply, recommended to use 3.7V and above. Support MP7, WAV decoding format, support for audio files up to 48KHz sampling rate. Support UART asynchronous serial port control, support play, pause, next/previous track, volume up/down, EQ mode switching, select song playback, specify path to play, specify path to interrupt, and other functions. 5W Class D amplifier, can directly drive 3W-5W speakers. Equipped with 32Mbits (4MBytes) storage. Can be connected to a computer via USB cable to replace audio files. SF5A is a compact serial port control voice playback module that supports MP3 and WAV decoding formats. It features a 3.3-5.2VDC wide voltage supply and can directly drive 4-8 speakers with a maximum output power of 5W. Onboard 32Mbits (4MBytes) flash memory allows easy replacement of audio files by connecting to a computer via USB cable. Suitable for various applications. Note: Product appearance and printed text may vary slightly between batches, but this does not affect functionality. Color: Black Material: PCB Package Contents: 1 x SF5A Module 1 x Speaker 1 x 340 Module 1 x Data Cable (Cable color may vary; specific color cannot be guaranteed) Note: Light reflection and differences in display screens may cause slight variations in the color of the item shown in the image compared to the actual product. Measurement error is permitted within +/- 1-3cm.