Portable SD/TF/USB/MMC Cards MP3 Player/Speaker HOT 1)ROHS,CE,FCC 2)With USB ... card,USB Portable SD/TF/USB/MMC Cards MP3 Player/Speaker HOT1)ROHS,CE,FCC 2)With USB and SD ... . Application: notebook computers, mobile phones, MP3, MP4, DVD, CD, U plate and the audio equipment outside put.2. Applicable ... Hz ac-20 KHz6. The built-in battery: 2000 ma7. Speaker specification: 2 inches * 28. SNR: acuity 58 db9. ...