... 30mm TM2603 Simple USB MP3 Music Decoder Mp3 audio decoding board, increased the signal switching, USB/SD switch, And the radio program function, let ... .MP3 PLAYINGConnect power supply DC+12V,Plug the USB with MP3 OR WMA music , the M3 is playing from track 1. ... volume.Press “PLAY/PAUSE”, Pause music player;and Press “PLAY/PAUSE” Again, the music to start playing . TM2603 Simple USB MP3 Music Decoder