Review on KOIOS H13 HEPA Air Purifier for Home, Small Room, Office Desk - Removes Pet Hair, Dander, Smoke, Pollen - 100% Ozone Free - Night Light by Ken Arellano

The air purifier is working properly. However, you will receive a card with your purchase to qualify for a free gift. Either a replacement filter or a $20 Revain gift card. Don't fall for this or the warranty like I did. They ask for your address so they can mail it to you. They'll then send you a Facebook message to let you know they're out of stock and need your email address to send you a code for a free Amazon gift card. They also asked for my PayPal account information. I wish I had known all this before ordering. So I warn everyone else.