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> This will significantly decrease the waste footprint from a whole filter.. to just a sticker

I don't think I understand which problem this solves. I can turn on my Xiaomi Air Purifier with or without a filter. It's just a fan. Is this about a new version that does not work with an old filter?

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I have Air Purifier 3H, and with an old filter it displays big red “0%” most of the time, instead of showing PM2.5 level. Which is annoying.

And the filter works effectively a few times longer than what is displayed (at least according to the PM2.5 sensors on the same device).

Mine too, I have the 2S.

However I have read that the new air purifiers (from the 3 onwards) switch off after a couple of hours when they don't see a filter sticker, or a used-up one.

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