1PCS Excellent U-disk audio player Voice module SD Card Voice module WTV020-SD The product supports plug-maximum the 1G capacity of the SD card Supports playback of 4Bit ADPCM format files Automatically recognize the voice files; Loadable 6KHz to 32KHz, 36KHz sampling rate AD4 audio; Loadable 6KHz ~ 16KHz sampling rate WAV audio;