The Gotek Portable Shoe Deodorizer & Sterilizer was designed with advanced technologies to revitalize your shoes in just an hour. With electronic accuracy, it kills 99.97% of bacteria, from the kind that leaves a nasty odor to the kind that causes athlete’s foot. With a press of a button, the ozone and negative ion molecules penetrate every part of the shoe and keep it fresh for up to 16 hours of active use. It does not overheat or overdry your shoes, so it doesn't influence the shoe material in any way. A built-in 1800mAh battery can sterilize up to 27 pairs of shoes with just one full charge, for a month of convenient, portable use.