The ultimate portable personal air filter. Allows you to filter odor and reduce second hand-smoke upon exhale. EASY TO USE: Using this product ensures that your room has clean air and no bad odours. HIGH QUALITY MATERIALS: Aircraft Grade Aluminum Casing and 2 Stage Medical Grade Filter. Activated Carbon Filter + HEPA Filter REPLACEABLE CARTRIDGES: Instead of Buying a Whole New Filter, Simply Replace With a Cheap, Easy To Change Replacement Filter! Also Has Removable Mouthpiece and Cover for Easy Cleaning LONG LASTING: Lasts Up to 500 Exhales Before Needing to Be Replaced. The Average User will use this for 2-3 months before needing to replace.