Using the iFixit head magnifier is easy. First, adjust the strap using the dial control to fit your head comfortably. Once it's on, you can choose the magnification level you need. If you need more magnification, flip down the second bi - lens. The loupe can be installed on either the left or right side according to your preference. When using the LED lighting, remember to insert two AAA batteries (not included). As for maintenance, keep the lenses clean with a soft, dry cloth. Avoid using harsh chemicals or abrasive materials. When not in use, store it in a safe place to prevent damage.