The PCB is focused on playing songs and audio files of types (WAV and MP3 up to 60 kbps). There are buttons to Control Audio Playing (Play Next, Play Previous, Pause). Also we have an LCD to keep track of songs name and to be more user friendly. The PCB is powered by 3 AAA batteries with a total of 4.5v which is more than enough to run perfectly not to miss about. The PCB can be connected to earphones, headphones, speakers all throw an audio jack port