* 128M/256M optional * support Music format: MP3 and WMA * 360 degree unique revolving USB designing * USB Mobile HD function * No driver needed except for Win98 * All the Languages supported * 7 Colors backlight * 18/19 hours recording time * hardware upgrade function *1 continure;y plays 15 hours * Supporting 12 EQ mode & SRS WOW *, with two earpphone out , can share the music by two person at the same time. * Size:?26.5mm X 86.5mm *Weight: about 42g(Included battery) Origin Shenzhen, China Delivery lead time 10-15days Minimum order 200PCS Supply ability 100000pcs/month