Long press the open button, the light is available to be adjusted from 10% - 100% of brightness. Also you can short press the button to select 3000K warm white, 4500K neutral white light or 6000K daylight. The mirror power switch and anti-fog switch are all-in-one design. This built in anti-fogging function means no need to constantly treat your mirrors with fog free spray. The anti-fog function will be turned off automatically in one hour, safe and energy-saving. The wall switch can directly control the on/off of lights and anti-fog. When the led mirror is powered off and restarted via the wall switch, the last used state is restored. UL-listed electronic parts, and covered by safety housing. LED lifetime: over 50,000 hours (Using the mirror 3 hours a day means it will last 45 YEARS), Copper-free Silver Mirror, much less corrosion rate compared with normal silver mirrors.