... radio,built-in Lin-ion 4.USB cable Features: This subwoofer speaker can link to MP3, MP4, Notebook, CD, DVD, ... ,(W)61MM· Sound respond frequency:150-18000HZ(±3dB)· Nominal Output Power (Total): 100 Watt · Audio Amplifier: Integrated · Built-in Devices:, ... ) · Power Device: Power supply - internal · Voltage Required: AC 120/230 V ( 50-18K Hz )· Impedance: 8 ohms· Output: RMS: 2*5W subwoofer speaker