Dock HEPA filter compatible with Shark Detect Pro Cordless Auto-Empty System Vacuum Cleaner IW3511, IW3120, IW3511AMZ, IW3615, IW3110C, IW3111C, IW3120C, Compared to original part XFIW1000. HEPA high efficiency filters can efficiently remove 99.9% of air pollutant particles as small as 0.3 microns. Washable / Reusable - Simply rinse with clean water and let it completely air dry before reusing them. Easy to install. Just take out the old filter and put this in. Regular cleaning on the filter is highly recommeded to improve the suction. Suggest to replace the HEPA filter every 6 month to optimize the performance. 4 HEPA filters included. Size: 4.5" x 3.3" x 1.4"