Specifications:Voltage: 12VPower: 2200WSensibility: 90dBPrimary Color: BlackRated Power: 4x100WMaximum Power: 1000WMaterial: lightweight aluminumFrequency response: 20Hz-20KHzProduct Name: 2 Channel Car AmplifierDimensions: 23cm x 22.5cm x 5.5cm(LXWXH)Function Operation Instructions:1.Power on offConnect the power supply , the 12V is connected to the level positive electrode, and the negative pole of the ground wire and the level are connected together. The control line connected to the car key control power of sound subwoofer control line. The machine is switched on automatically and blue light is on , and when this red light is on , the speaker is short circuited.2. Volume AdjustRotary volume potentlometar can adjust small volume or enlarge volume.3.Full frequency and bass selection adjstmentThe switch is placed in the bass position , At this time only the bass output is used, The potentiometer can change the bass frequency to meet the different requirements of the bass.4.Regulating treble and bassAdjusting the treble and bass potentiometer can change the bass effect.Package Included:1 X 2 Channel Car Amplifier1 X Users Manual1 X Screw KitsNote:1.We provide clear pictures, measurements where possible. Please check as much as possible to make sure the item is the one that you need.2. Please allow 0.5-1 inch difference due to manual measurement.(1inch=2.54cm)3.Although instruction is included.Professional Installation Is Highly Recommended!