... TypeLi-ion batteryInput DC 5VOutput powerRMS 4WMaterialWoodenRecycling lifeAbove 500 timesApplicationFor iPod,MP3,MP4,MP5,PC,Laptop/Notebook,Mobile phone,etc WarrantyOne ... can enjoy the music from mobile phone,MP3,MP4,PC,IPOD and other audio devices,no need to shift among U disk ... 18KHz3)Loud Speaker: 2inch(external diameter 50mm); 4Ω4)Signal and noise ratio of power amplifier: ≥80dB5)Output: 3.7V* ...