MASK NOT INCLUDED! This fog wiper is a manual device that allows the user to slide a wiper/magnet on the outside of the lens, causing an inside wiper/magnet to move in unison and wipe off fog. SIMPLE! This product works even with prescription lens masks. and with contact lenses. Note that unit price (quantity=1) is for one wiper/magnet on the inside and one wiper/magnet on the outside; If your mask has two separate lenses, you must order TWO (quantity=2) units. Wide-i fog wipers for Swimming Goggles, Professional Dive Helmets, Ski & Snowboard Goggles, Airsoft & Paintball Masks, and Firefighter Masks, are also available at Amazon.