This little board is designed based on VLSI VS1053B clip. The VS1053 is a processor chip MP3 encoder capable of playing a variety of music formats, including Ogg audio Vorbis/MP3/AAC/WMA/MIDI.
To improve the sound quality of the headphones, the VS1053 includes EarSpeaker spatial processing that accurately simulates how it would sound in a room with stereo speakers.
Besides being able to decode all formats, VS1053 is capable of recording file format Ogg Vobis.
Includes SD card connector, can play MP3 files from SD.
Compatible with Arduino
SPI interface, the control signal lines held
Includes stereo headphone
Includes a microphone for recording
power indicator
The AMS-1117 chip 3.3 V and 2.8 V LDO, provides up to 800 mA of current
It works with a single power supply pin to 5 VDC
12.288 Mhz Crystal

Decodes formats:
Ogg Vorbis
MP3 = MPEG 1 & 2 Audio Layer III (CBR + VBR + ABR)
MP1 and MP2 = MPEG 1 and 2 audio layers I & II optional
MPEG4 / 2 AAC-LC + (PNS), HE-AAC v2 (Level 3) (SBR + PS)
All WMA4.0/4.1/7/8/9 files (5-384 kbps)
FLAC lossless audio with plugin software (up to 24-bit, 48 kHz)
WAV (PCM + IMA ADPCM)
General MIDI 1 / SP-MIDI format 0

Encoding formats mic / line
Ogg Vorbis with software plugin
IMA ADPCM
16 bit PCM
Click here to download the technical specification sheet or datasheet