Power connection:
1.Car has a CD player : GND then negative vehicle power ; 12v power supply connected to the car 's positive ; REM CD player connected to the control line (so the CD player can directly control the subwoofer amplifier on and off )
2.Car no CD player : GND connected to the negative power of the car , + 12V and REM connected together in positive 12V car power ( + 12V can also be an indirect one with REM switch control amplifier switching function )
3.Directly with the battery (battery) connection : GND connect the battery negative , + 12V and 12V REM then the positive battery simultaneously.

Note:
There are no instructions included in this kit.Professional Installation Is Highly Recommended！

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Package Includes: 1pcs 12V 1000W Amplifier Board PA-80D