... for friends or customer. Product functions:1. MP3 format suppor,2. U disk support,3. ... function6. USB charge7. Plug and Play, no drivers8. Compatible with laptop, iPod,MP3,MP4,MP5,cellphone,PSP etc ... USB 5V or 3*AAA batteries) Features:1. MP3 Digital decoder chip2. Anti-magnetic speakers (2 pcs ... to 50%5. Speaker output short circuit protection and thermal protection6. Dynamic Bass System, stirring sound ...