Item Type: MP3 Decoder Module SPI Interface: Control signal lines are all led out. Output Interface: 1 headphone and audio output interface. Microphone: 1 microphone for recording. Input Interface: 1 line_in input interface. Power Indicator Light: Yes Current: Onboard 3.3V and 2.5V LDO 1117, providing 800mA current. Single Power Supply: +5VDC, capacitor filter. Crystal Oscillator: 12.288 Mhz crystal oscillator. Printed Circuit Board Size: Approx. 50 x 40.5mm / 2 x 1.6in Package List 1 x MP3 Decoder Module 1The MP3 decoder module supports decoding many audio format, including MP3, MP3+V, WMA, WAV, MIDI, SP-MIDI. 2The recording encoding format is IMA ADPCM (mono), and supports microphone and line input two input methods. 3Supports MP3 and WAV streams, has internal phase-locked loop clock multiplier as well as low power consumption. 4Equipped with stereo digitaltoanalog converter (DAC), 16bit adjustable onchip analogtodigital converter (ADC). 5Has stereo earplug driver (30 ohms), separate analog, digital and IO power supplies, and serial data and control interface (SPI).