Detailed Product Description 2.0Home Theater speaker 1, Frequency: 55--18KHz Power RMS: 30 W Nominal Impedance: 4Ω Sensitivity: 85dB2, 1" rubidium iron silk membrane tweeter*1 2.5" cone whole tone*1 3" cone whole tone*1 side 6.5" cone bass*13, USB connection,Built-in amplifier board,Output power=2*20W4, (W*D*H)=148*315*600(mm)