Main function 1. Handy fashion bagthe inner of the bag is used high quality silk flannelette, so it can protect handset and MP3 very wellthe bag is used high quality PU leather and EVA, the feeling is good and it has strong anti-shock ability. 2. Handy sound boxthis bag can be considered as sound box, it has very thin wafer in sound box, so it can provide good sound, transfer clear sound. It can connect MP3, CD, personal stereo, notebook computer and many multi audio devices. Quality of tone is much better than inner sound of notebook computer, so you donot need the earphone and can enjoy the music at anytime in anywhere 3. Personal earphoneyou can communicate with others freely by the personal earphone.4. The best advantage is that you can carry it for traveling and collecting an outdoor party with a MP3 and MP3 sound box. Sound function technology parameter reproducer: One impedance:4hmfreguency range:275hz-20khzoutput power:3wpower supply outfit:3.0v(2*aa)battery natural life: > 7ho