... -in Lin-ion 4.USB cable Features: This subwoofer speaker can link to MP3, MP4, Notebook, CD, DVD, Mobile phone,IPOD,iPhone ... /SMM card, Auto play function2)with Aux-in connection, support: MP3/MP4, computer, music mobile & iPod, etc3)Stereo sound design, excellent ... ( 50-18K Hz )· Impedance: 8 ohms· Output: RMS: 2*5W subwoofer speaker