A pocket sized smoke filter great for minimizing smell and secondhand smoke REDUCE SECONDHAND SMOKE: The Philter labs Zero-5 technology can last up to 150 exhales to capture and dissolve odor-causing particulates, pollutants, and VOCs. CONVENIENTLY CARRY IN YOUR POCKET: With a design utilizing advanced aerodynamic principals, fit it into your purse, backpack, car, jacket or any other pocket! ENJOY ALMOST ANYWHERE WITH EASE: One of the easiest air purifier filters to use, simply take with you and after you inhale, discreetly exhale into this portable air filter. HAPPILY SHARE ANY SPACE: With a uniquely layered filtration technique, developed to treat highly varied and dense secondhand smoke for air everyone can breath easy in.