So these are two NFC tags and 6 stickers you can stick on the NFC tags. Can store 931 bytes of data which is a lot - almost 8 times more than normal (simple) NFC tags. Was able to delete the contents successfully and write arbitrary data to it with an NFC app on my smartphone - so you can also use them for anything you like - they are not tied to the Mi Home App as you can erase the contents and rewrite them.