And when you lose the ring, get a new one immediately instead of waiting for the would-be assailant to come along.
And when you lose the ring, get a new one immediately instead of waiting for the would-be assailant to come along.
* What is the ring/watch material made of? How durable is it.
* For the "smart ring", can I get this sized-to-fit?
* What exactly is powering this scanner? What happens without power?
These are just concerns off the top of my head; I'm sure there are other concerns I'm not thinking of. Should my fob become damaged/dislodged in a scuffle what happens then? With a firearm, what you don't want is fragility.
Re battery dying - if I was designing a smart gun, I would have it default to a regular, usable-by-anyone gun if the power dies. That way you don't have to worry about mastermind criminals with EMP devices either.
It'd at least prevent someone from grabbing your gun and immediately shooting you with it.