... :DC12/24V,AC220V 4)Pass CE 8''support SD,USB,MP3 active subwooferDetailed index: BrandWeiDaModel No.WD-8004UsageSuitable for ... car, truck, motorcycle or homeVoltage(v)DC12 /24,AC220VSize(mm)Ø230*240Impedance(ohm)4Speaker’s Size(Inch)8Sensitivity ... be make.2. Embedded amplifier 3..Can support SD,USB,MP3 function.4. FM radio function for option 5 ... . 10 inch round shape car audio subwoofer with USB