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...but why? to access work/apartment/etc by touching the fob reader? to scan your favourite amiibo and spawn some fish in breath of the wild?
In any case I don't see how this can be considered biohacking. I could just stick it on and hide it with stage make up to do the same. or a sticker or have it hidden in a layer of my sleeve.
I got one because I kept locking my hotel keycard in my room when I was at conventions and for that very limited purpose it is kinda ok but I dont use it daily and I go to quite a few cons because I work at them