MP3 player is a musical device to listen music. It contains a small circuit of playing music like audio files whose extension is in .mp3. These .mp3 audio files are available in memory card or USB Flash. What we can do with MP3 Player This player is also available in all latest mobiles to listen music. Due to this reason the popularity of these devices is no more. One another reason is that , there sizes are very large than mobile. So everyone prefer to buy mobile than spending rupees to buying musical device. Here i am not asking you that you should not buy music device anymore but if you want to use it for musical concert then it is good because mobile is not good for this purpose.But one advantage of them is that, there sound is very loud and Bass. Thanks for reading it. Any information i found i will upload it here.