Pairing Method: 1 With 2 Filters. The Filter Should Be Replaced Once A Week, But The Filter Should Be Replaced According To The Actual Situation. M-Shaped Nose Clip, Dust-Proof Face Decoration, Can Be Filtered According To Everyone'S Nasal Cavity Type, So That The Face And Nose Fit More Closely, So As Not To Leave Marks On The Face. Flexible And Adjustable Earhook With Adjustable Size, Suitable For Most Head Types. Suitable For Adults, Men, Women,Protect You From Dust. The Ideal Way To Protect Your Mouth And Face. When You Go Out, You Can'T See Too Much Dirt In The Air. Suitable For Cycling, Camping, Running, Traveling, Climbing And Daily Use. Your Health Is Priceless And Ideal For Gardening, Traveling, Running, Hiking, Sports, Buses, Etc. Stylish And Suitable As A Gift.