CONVENIENT CLEAN AIR. LESS WASTE. Our signature Personal Air Filter is equipped with a state-of-the-art internal replacement system that ensures a clean, smell-free, breath of air without having to throw out the whole unit! 2-In-1 Eco-Friendly Box, You Get 2 Official Replacement Filters for the Eco Four Twenty Personal Air Filter LONG LASTING: Lasts Up to 500 Uses Before Needing to Be Replaced. The Average User will use this for 2-3 months. HIGH-QUALITY 2 STAGE FILTER: Activated Coconut Shell-Carbon Filter + HEPA Filter means this filter more than cheap competitors! EASY TO REPLACE: Simply Unscrew the Eco Four Twenty Personal Air Purifier and replace the filter. It takes only 3 seconds! LIFETIME WARRANTY AND 100% COVERED BY MONEY BACK SATISFACTION GUARANTEE: If For Whatever Reason you Don't Love Your Eco Four Twenty product, Simply let us know and We Refund Your Money. WORKS WITH ALL ECO FOUR TWENTY PERSONAL AIR FILTERS