An air fan with a 99% antibacterial rate that circulates the air inside the mask and supports comfortable breathing. - Brand: PRISMATE - Model Name: Mask Air Fan - Weight: 22g - Antibacterial Rate: 99% - Application: Air circulation inside the mask I purchased this but have not used it, as it remains unopened. The box has some minor stains, so I've listed it as "Like New." No returns or exchanges accepted. Thank you for looking.