I bought the super it sm007 mp3 player before 3 month ago so I observed that in this device at first it is take a long time period to full charging. And then the bettary backup good for at starting but after some time the bettary backup was reduced. And at the full sound it is not give clear sound. And the design of this device is not more attractive. in which some types of earphones is not support in this. And according to it’s price not proper features in it. So I think my review will be usefull for you. Thank you.