Thanks for your contact and purchase. I'm Cara for your customer service.
After reading your message carefully, we understand that your purchased air purifier sensor doesn’t work.
We're deeply sorry for that.
To solve this issue quickly, could you please send your issue video to the email of firstname.lastname@example.org, After we have done the further investigation, we'll resend a new item to you right away or issue a full refund after receiving your confirmation.
Before arranging the new item, could you please let us know the following information in case of a wrong shipment?
1) current address
2) phone number
3) order ID
Highly appreciate your kind understanding again, and look forward to your reply soon!