Mp3 player is a tool that we used to play a data file that is usually a song or music with format .mp3. A few years ago I once also assemble an mp3 player that we can use fun for fun. Mp3 player that I created is in addition to play mp3 files can also play sound from the radio, besides that Mp3 player that I made first it also can I enable as a remote tv that can be used for all tv brands like in the video below. I made the mp3 player with the casing and pcb which is one flanking a 1000mAh battery which at that time could light up to 2 full days without having to recharge the battery. : D who would listen to songs for 2 days yes hehehehe