1.It has built-in Lithium battery, can play music and sync charge when use USB power
2.Directly connection to personal computer, MP3, MP4, DVD, CD, iPod, PSP, Mobile phone, flash disk and micro SD card(Not included)
3.It can play music by inserting the flash disk, SD card and MP3 directly (It can only decode mp3 format music)
4.There is a blue Led light at the bottom
5.Compact and small, easy to carry
6.Size: 108 X 65 X 27mm

Specifications:

1.Power Output: 6W RMS (3W+3W) THD=10%
2.Frequency Response: 150Hz-18KHz ( ±3dB )
3.SNR: ≥80dB
4.Loud Speaker: 1.77inches(external diameter 45mm) Magnetic resistant 4Ohms
5.Line In: 3.5mm stereo's plugs
6.Power Supply: 5V/1000mA AC power adapter or USB cable
7.Single Speaker Dimension(inch): Approx. 6.16(L) X 1.97(W) X 1.97(H)(164 x 50 x 50mm)
8.Battery Charging Time: About 4 hours
9.Battery Play Time: About 5 hours