Audio format: MP3 Screen color: no Additional function: loudspeaker function Battery type: lithium battery Features: 1. Trendy case, innovative ultra-thin design, ultra-small size. Weighing less than 30 grams, simple, exquisite and stylish. 2. Support digital music playing of multiple MP3 music formats. 3. It can be used as a mobile flash drive to store MP3 songs or data anytime, anywhere. 4. Support TF memory card, maximum 16G. It can be also used as a TF card reader. 5. It also has the functions of MP3 and mobile storage disk. 6. It uses USB1.1/2.0 interface, supporting hot swap, plug and use. 7. Built-in 90mah lithium battery allows for continuous playing for 3-4 hours, without external power supply requirement. 8. It uses a variety of operating platforms WIN98/SE/ME/2000/XP.LIUXCORE2.4 and above. 9. Storage media. No mechanical parts, anti-vibration, anti-electromagnetic-interference. 10. Built-in high-energy rechargeable lithium battery features long standby time.