... year Main features:Output: RMS 3W THD=10% Frequency response: 150-18000HZ (+-3DB) Signal and noise ratio of power amplifier :>=80Db ... resistant 4 Ohms Power supply: 5V/1000mA AC power adapter, Computer USB Power rotate connect line (can choose), Built in Rechargeable ... , MP4, CD, DVD, iPod, iPhone, GPS, PSP, mobile phone, notebook computer, U disk and SD card etc. Package Includes:1 x ...