PERFECT COMPATIBILITY: Our -K1 replacement filter is for ToLife -K1 air purifiers, FreAire 6391RGB & HAP601 air purifiers, MK01 air purifiers and MK06 air purifiers. (Not Fit for Tolife -K2 & K1 Plus). Work just like that come with unit. Please check your model before making an order. FILTRATION: Our -K1 replacement filter for ToLife air purifiers is high-efficiency True HEPA filtration systems including Ultra-fine Pre-Filter, H13 Grade True HEPA Filter,and Activated Carbon Filter. They work together to capture up 99.97% of all airborne particles down to 0.3 microns in the air like dust, hairs, pet fur, lint, and prolongs the life of HEPA filter for -K1 air purifier to keep clean from dust, pollen, smoke particles, pet dander, creating fresh. HIGH PERFORMANCE: The -K1 H13 HEPA filter for tolife air purifier can effectively remove airborne particles, improving the quality of indoor air and making people breathe freely; The high-grade activated carbon filter can efficiently absorb unwanted odors, fume, smoke, and cooking smells, as well as filter pet odors in your living space for improved air quality, ideal for pet owners, smokers, and people who live in cities WARM MAINTENANCE TIPS: Just need to remove the packaging of the filter, then place it into your mahcine for ToLife air purifier -K1. And its lifespan varies to the existing air conditions, it is recommended to replace it once for 3-6 months. Colour:Black Material:Plastic + non-woven fabric Package Contents: 2 * Replacement Filter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.