ESR660 is a high quality regulator/rectifier that replaces the OEM regulator on the Honda NX650 Dominator models. We incorporated our latest generation power circuit inside our very efficient heat sink design resulting in our ESR660 which is superior to the OEM regulator. Our ESR660 offers a superbly stable output voltage which means your battery will get the optimum charge at any engine RPM. ESR660 is a Plug-In replacement regulator/rectifier that comes with a full one year warranty.