3 optional :

1.with usb port ,tf card slot .
2.not support TF card and usb drives .
3.support bluetooth 
● Support u-disc/SD/AUX
● Support WMA/MP3
● Super Bass(special tech.)
● Power supply USB/Li-battery
● USB data transfers
● Recording
● Frequency: 90Hz-20KHz
● FM radio,auto search   
● Frequency: 90Hz-20KHz   
● SNR≥70dB        
● Power: 3W

Li-battery: 500mah Material: ABS