Fool proof system this. Physical device which you must always have on your person no matter what. If it’s on your keychain and you want to put those keys in your locker at the gym then you’d have to remove it from your keys. Genius. Next.
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You don’t have to keep it on a keychain. Could be on a bracelet. Necklace.
You prescribing a specific place to keep it, is your stupidity. Not a flaw of the device.
Ok folks, and there it is. Case closed.