Portable Card Speaker、TF card speaker

selling point：
1).TF card speaker: can read TF and mobile card
2).3.5mm audio plug: plug and play with any audio devices with 3.5mm audio jack
3).With wirst strap: can be hanged on bag and wrist as a travel speaker                  
4).Rechargeable Li-ion Battery: can be recharged by USB power

Specification：
1).Rated Power:2W
2).Frequency Response:100HZ-20KHZ 
3).S/N Ratio:≥80db 
4).Power Supply:Li-ion, battery
5).Output:4.2V/250MA
6).Speaker Drivers:2W/4Ω 
Available color: Blue/Red/Silver/Black
Accessories:Audio cable, USB Cable
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