1. 3.3-5.2VDC power supply, 3.7V and above is recommended 2. Support MP3, WAV decoding format, support audio file sampling rate up to 48KHz 3. Support UART asynchronous serial port control, support play, pause, up and down songs, volume increase and decrease, EQ mode switch, song selection, specified path play, specified path insert and other functions 4. Comes with 5W Class D amplifier, can directly drive 3W-5W speakers 5. Comes with 32Mbits (4MBytes) storage 6. Can connect to the computer via USB data cable to change audio files CX-SF5A is a compact serial port controlled voice playback module that supports MP3 and WAV decoding formats. 3.3-5.2VDC wide voltage power supply, direct drive 4-8 speakers, maximum output power 5W. Onboard 32Mbits (4MBytes) flash storage, connected to the computer via a USB data cable to change audio files, suitable for many scenarios. Colour:black Material:PCB style:B Welding terminal board Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Package Contents: 1 * Voice Playback Module Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.