How long will they work? Do you need to replace them?

Plut in the socket works 24 hours without additional purchase.No need to replace the filter chip.

how many square feet covers each device?

A product is suitable for 10 to 20 square meters of space. If the room is relatively large, it is recommended to put a few more

What parts per million (ppm) does it have?

Intelligent chip processing, release 40 million negative ions, deal with peculiar smell and air impurities, and work continuously to achieve the effect of purifying the air.

Will the wall behind the purifier get dirty?

So far, my wall is not dirty. I could have chosen any brand, but this one does not require a filter. I have a lot of allergies and had been hacking for some time, soon after putting one in my bedroom I quit coughing . No noise!

ASIN	B09H4YT4V8
Best Sellers Rank	#2,045,311 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #318 in Home Travel-Size Air Purifiers
Brand	SAIMLOVE
Brand Name	SAIMLOVE
Control Method	Touch
Customer Reviews	3.3 out of 5 stars 311 Reviews
Filter Type	Ion
Item Dimensions D x W x H	5"D x 2"W x 3"H
Item Height	3 inches
Item Weight	0.07 Kilograms
Manufacturer	SAIMLOVE
Model Number	JHQ-12S
Noise Level	30 Decibels
Power Source	AC adapter
Product Dimensions	5"D x 2"W x 3"H
Specification Met	FCC Certified
Unit Count	1 Count
Wattage	5 watts

SAIMLOVE Mini Home Plug-in Air Purifier,Power Saving, Silent Suitable for home, bathroom, living room, bedroom, hotel, pet room, toilet

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