The HI-LOW-OFF switch replaces the standard ON-OFF switch. The switch allows for independent adjustment of the lights, separate from the vehicle's OEM lighting system. In addition to the molded silicone sealing gaskets, Denali uses a unique DrySeal™ construction technique that encloses the wires in an encapsulated cavity as they enter the housing. The switch is also a great option for those who want complete independent control of their auxiliary lights.