Where are the air quality sensors located on my air purifier?

About us <svg class="icon icon--down" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"> Active - Down <path d="M5.66357 9.36982L6.33625 8.62988L11.9999 13.7787L17.6636 8.62988L18.3362 9.36982L11.9999 15.1301L5.66357 9.36982Z"/>

Support <svg class="icon icon--down" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"> Active - Down <path d="M5.66357 9.36982L6.33625 8.62988L11.9999 13.7787L17.6636 8.62988L18.3362 9.36982L11.9999 15.1301L5.66357 9.36982Z"/>