... MP3 module,voice module,sound module,sound module,audio module,usb audio module,module digital audio playerFeatures * Audio module ,support MP3 files, stereo with ... 2GB .* Change voice in SD card easily by PC.* Audio module with four kind of control mode :mp3 mode, key ... music and advertisement is supportive*Support to play the inserted audio file*Capable of playing the specify music* Dimension: 41mm ...