AN INVISIBLE SHIELD FOR AN INVISIBLE ENEMY! Today, clean air has become more important than ever. Our Air Purifier Necklace functions as an invisible shield that forms a protective zone around you. It can effectively purify the air around you to remove harmful substances such as pollen, dust, second-hand smoke, bacteria and mold. Compact and stylish, it can be hung from your neck, in your car or in other closed spaces with poor air quality. Simple to use, just press the button for two seconds to enjoy the fresh air. Comes with USB charging cable - a 30 minute charge keeps it running for up to 20 hours.