This item is a USB card speaker, which suppor USB flash, SD card. It is also with FM radio funtion. It's hot-selling now.
Specs: 1) Rated Power: 3W+3W 2) Frequency Response: 120Hz-18KHz 3) Speaker Size: 2" * 2 4) S/N: ≥ 70dB 5) With Li-ion Battery: 3.7V 600mAh 6) Material: High quality plastic 7) Built-in: Audio decoding system 8) Working Voltage: DC5V 9) With SD card slot and USB disk slot, with FM radio
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