how to use: <br>Step 1: Remove the product after washing your hands.<br>Step 2: Put the activated carbon filter pad in the cover to prevent slipping.<br>Step 3: Install the activated carbon filter, put it on your face and wear it correctly.<br>Product Specifications:<br>Material: non-woven fabric, melt-blown fabric.<br>Dimensions: 4.72 inches x 3.15 inches<br>note:<br>1. When there are stains of thin film or sticky deposit, please replace the filter.<br>2. The filter element cannot be cleaned and should be replaced daily for best protection.