Portable Air Filter This personal air filter by Eco Four Twenty is so easy to use, simply exhale smoke through this device to reduce harmful second-hand smoke and odour that can affect your roommates, family and neighbours. This device's casing is made of high-quality aircraft-grade aluminum and 2 stage medical-grade filter with activated coconut shell-carbon filter + HEPA filter. It lasts up to 500 exhales, instead of buying a whole new filter you'll only have to replace it with another Eco Four Twenty filter cartridge. Backed by Eco Four Twenty's Lifetime Warranty and their 100% satisfaction guarantee, you will not be disappointed. Air Filter Features: Easy to Use High-Quality Materials Replaceable Cartridges Long-Lasting: 500 Uses | 2-3 Months Lifetime Warranty How it Works: Simply exhale smoke through this device to reduce harmful second-hand smoke and odour that can affect your roommates, family and neighbours. The filter is good for 500 uses. What's in the Box: 1x - GO Personal Air Filter by Eco Four Twenty 2x - GO Filter Cartridges - Long Lasting 500 Uses - High Quality 2 Stage Filter Activated Coconut Shell-Carbon Filter + HEPA Filter