4-Channel 7900W Car Power Amplifier Amplifier Class: Class A/B Stereo surround Main push four-door speaker Passive subwoofer Slim design Aluminium alloy casting drawing process External heat sink Thermal Overload & Speaker's Short Protection Channel: 4 Working Voltage: DC 12V Power Output: 7900W Total Harmonic Distortion ()RMS Output: Less than 0.02% Signal-to-Noise Ratio (): 95dB Sensitivity: 150mV Impedance: 2~4 Frequency: 20Hz~20KHz Colour:black Material:Aluminum alloy Package Contents: 1 x Car Amplifier Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.