1. VS1053 audio decoding module supports playback of various music formats and OGG real-time encoding recording. 2. AVR processor used for MP3 development with SPI interface available on board for easy connection. SPI interface and control signal pins are broken out. Includes 1 headphone and speaker output connector. Features 1 microphone for recording. 1 line-in input interface. Power indicator included. Working voltage: DC 5V with capacitor filtering. Onboard 3.3V and 1.8V LDO chips (1117) provide up to 800mA current. Crystal oscillator frequency: 12.288MHz. Interface: 3.5mm headphone jack. Cartridge microphone for recording. IN: Input mode to select ADPCM recording source. When set to 0, microphone input pins MICP and MICN are used. When set to 1, LINEIN is used. SPI: SPI download connection. Product dimensions: 45 x 45mm. Color: Green. Material: PCB. Package includes: 1 x VS1053 MP3 Board. No additional items included. Note: Lighting and display differences may cause slight variations in color. Measurement error allowed is +/- 1-3cm.