Fog Free Reflections is a 120V heating element that installs invisibly behind the mirror to prevent it from fogging. These ultra-thin, flexible, carbon/Mylar® panels easily mount behind the vanity mirror and work with a simple flip of a switch. It may be wired into your existing light fixture or run on a separate switch – the choice is yours. And Fog Free Reflections' gentle heat costs less to run than the average light bulb. See Fog Free Reflections' technical specifications. All units come with a 10-year guarantee.