The Freedom SW 2000 Inverter/Charger is offered with the GFCI (Ground Fault Circuit Interrupter) option to enable you to plug electronics directly on the inverter/charger. This ground fault protected AC output is also a requirement for certain mobile applications. The GFCI plate can be mounted directly and quickly on the Freedom SW 2000.WARNING: This product can expose you to chemicals including Diisononyl Phthalate (DINP) which is known to the State of California to cause cancer, and Di-isodecyl Phthalate (DIDP) which is known to the State of California to cause reproductive harm. For more information go to P65Warnings.ca.gov.