Powerful deodorizing with the power of bio. Special synthetic oxygen is added to the special filter with activated carbon, which quickly absorbs the odor and chemically turns it into an odorless substance. Not only adsorption, but also deodorizing with catalytic action, the effect is long-lasting, and there is almost no re-release odor. The special filter has Ag+ (Silver Ions) attached to the surface of the filter to disinfect airborne bacteria inside the shoe box. Compact and thin, 90 degrees open to fit into the corner of the shoe box, providing powerful deodorizing and deodorizing effect without getting in the way. In addition, the deodorizing period lasts up to 2 years, and the aromas and perfumes do not decompose or deodorate, so you can use it with your favorite air freshener. Unscented