... TF and SD card 2,earphone output 3,Built-in rechargeable battery 4,audio input Future:*Support USB, TF and SD card ... , limited space to enjoy unlimited high-fidelity music*Built-in rechargeable lithium battery *3.5MM headphone output interface and earphone interface, wallyson ... :≥80dB*S/N Rate: ≥80dB*Accessories: USB cable, audio cable, battery