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. Support TF card (memory card), U disk; capacity within 32G, FAT32 format 6. Support custom audio files -ST5B is a compact serial port (UART) controlled voice playback module that supports MP3 and WAV decoding formats. 3.3-5.2VDC wide voltage power supply, direct drive 4-8Ω speakers, maximum output power 5W. Support TF card, U disk, connect to the computer via USB data cable to change audio files, suitable for many scenarios. Colour:black Material:PCB+Plastic Package Contents: 1 * -SF5B Voice Playback Module 1 * speaker 1 * -340 1 * USB data cable (data cable color is random, don't accept the specified color) 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.