Necklace-type space sanitizing sheet. Simply take out the main unit, attach the included neck strap, and wear it around your neck. The sanitizing ingredient, chlorine dioxide, removes floating viruses and bacteria from your surroundings from the moment it's opened (※when used in a small, enclosed space). Effective and powerful in enclosed spaces and situations with the "three C's" (closed spaces, crowded places, and close-contact settings). As it's a necklace type, it's even more effective when used with a mask. Also has deodorizing and mold-inhibiting effects. Effective for approximately 30 days after opening. Thank you!