1. VS1003: VS1003 audio decoding format: MP3, MP3+V, WMA, WAV, MIDI, SP-MIDI; recording encoding format: ADPCM (mono), microphone and line input (Line input) two input methods; Support MP3 and WAV streams; low power consumption; with internal phase-locked loop clock multiplier; high-quality stereo digital-to-analog converter () 2. 16-bit adjustable on-chip analog-to-digital converter (ADC); high-quality stereo Earplug driver (30 ohms); separate analog, digital and IO power supplies; serial data and control interface (SPI) 3. SPI interface, control signal lines are all led out 4. 1 headphone and audio output interface 5. Power indicator Onboard 3.3V and 2.5V LDO 1117, providing 800mA current Single power supply: +5VDC, capacitor filtering 12.288 Mhz crystal oscillator CB size: 50x40.5 mm colour: blue Material: plastic + metal Package Contents: 2 x Module Only the above package content, other products are not included. Note: Light 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.