Here are some modern features that perhaps one or two of these products listed here have;
Light signaling the need to replace the filter
Choices for dimming and turning off the display
Programmable timer
Remote control unit
Intelligent capabilities, such as a digital assistant and app integration.
The addition of these accessories may make operating an air purifier more convenient, but the additional cost may not always be justified. You may, for instance, set a calendar reminder to change your filter by the maintenance schedule of your air purifier. If you do this, you won’t have to worry about the filter replacement light turning on.