1, ONLY built in SD card slot
2, can not built in flash memory
3, without display screen 
4, music format: MP3 , WMA 
5. file format: FAT 16, FAT32 
6. mp3 bite rate: 8KBPS～320kbps
7. WMA bite rate:32bps～192kbps 
8. Earphone output power:5mW + 5mW Load 32Ω  
9.Frequency response:20Hz～20KHz
10. EQ: BASS
11. Connect to computer: USB2.0 (high speed),   Mini USB 5pin type