Specification and features: 1. High quality MP3 music play back1. Support major SD/ MMC card in the market2. One power switch and three buttons for EQ, tremble, bass boost, volume up, down, sequential and shuffle playing mode3. Shell colors including crystal, crystal blue, crystal green and white color4. 5 flash LED’s for eyes attention5. Using one AAA Alkaline battery or NiMH rechargeable battery6. Diameter 7.0cm, thickness 1.8cm7. Frequency response: 20 Hz ~ 20K Hz8. SNR: 82db9. THD < 1%10. Dynamic range: 88db11. Core chip used in NOKIA MP3 mobile phone, imported from Europe 12. Excellent sound quality