Dear Sushubh,
Greetings from Mi India Customer Support. My Name is Prutha.
Sorry for the delay in response.
I understand that you want to know the what extra is there in
Air Purifier filter 2S so that you can purchase the same. I will surely assist you on the same.
I would like to inform you that 2S is the updated version of Air purifier filter 2 and also OLED display is given in the new filter so that you can control the same according to the time.
For more details I request you to kindly go through below link:
Mi India
If you have further questions, please don't hesitate to contact us. We will be glad to assist you further.
You can also find answers to commonly asked questions here-
Online Help - Mi India .
Regards,
Prutha
Mi India Customer Support