Can connect laptop, mp3, mp4, mp5, cell phones, PSP, etc, supports USB, TF card, MP3/WMA files, with built-in FM radio (option). 1. Support TF card2. USB port3. Up to 8GB for convenience of unlimited songs4. Build-in rechargeable Li-ion battery and speaker5. Build-in card reader function and play music from computer 6. Output power: 2.8W7. Normal Impedance: 4Ω8. S/N or SNR: ≥65dB9. Frequency ...