Plug-In Negative Ion Air Purifier for Formaldehyde and SmokeImprove indoor air freshness with this plug in negative ion air purifier designed for convenient household use. Its compact plug in design allows it to be directly inserted into a wall socket, making it suitable for continuous operation in bedrooms, living rooms, and other small indoor spaces. Using negative ion purification support, this unit helps reduce common indoor concerns such as formaldehyde, secondhand smoke, and lingering odors. It is