1.input voltage :5.0v
2. output voltage :3.7V=1000MA
3.output power:2*3 watts(RMS)THD=10%
4.built-in recharge: Li-ion Batt
5.S/N:>=80dB
6.impedance:4 ohm
7.can connect with your MP3,MP4,Mobilephone computer,IPOD  and also can play with SD MMC and Flash memory
8.support SD/MMC card
9.can be built-in FM radio