1.MP3/WMA format decoder2.Volume control3.Work with all audio sources with a 3.5mm jack4. li-ion Battery inside5.Power Led indication and li-on battery charging indication6.Power Supply: DC 5 Volt(li-lon Battery inside) USB power cord7. Output Power: 2w+2w8. Driver Unit: 72mm speaker , 4ohms9.Frequency Response: 150-18Khz

USB 2.0 music angle mini speaker SP-288