... gift for friends or customer. Product functions:1. MP3 format suppor,2. U disk support,3. TF ... and Play, no drivers8. Compatible with laptop, iPod,MP3,MP4,MP5,cellphone,PSP etc. via 3.5mm audio ... ( USB 5V or 3*AAA batteries) Features:1. MP3 Digital decoder chip2. Anti-magnetic speakers (2 pcs)4.High ... -efficiency digital amplifier chip, saving power up to 50%5. ...