1. 3.3-5.2VDC power supply, recommended to use 3.7V and above. 2. Support MP3, WAV decoding format, support for audio files up to 48KHz sampling rate. 3. Support UART asynchronous serial port control, support play, pause, up and down song, volume up and down, EQ mode switching, select song playback, specify the path to play, specify the path to interrupt and other functions. 4. 5W Class D amplifier, can directly drive 3W-5W speakers. 5. With 32Mbits (4MBytes) storage. Can be connected to a computer via USB cable to replace audio files. CX-SF5A is a compact serial port control voice playback module, supports MP3, WAV decoding format. 3.3-5.2VDC wide voltage supply, direct drive 4-8Ω speakers, maximum output power of 5W.32Mbits (4MBytes) flash memory on board, connect to the computer to replace the audio files via USB cable, suitable for many scenarios. Due to different batches, there may be differences in product appearance and printed text, which will not affect use Color: black Material: PCB Package Contents: 1 x CX-SF5A module 1 x Speaker 1 x CX-340 module 1 x Data cable (cable color in the picture is random; data cable Random Color, 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.