True, that didn't really come to mind since they don't generally talk about allowing that for guns. The best thing is probably using one's phone as the token since the phone has bluetooth and this article mentions that the tools are unlocked with that.

The reason I brought up biometrics is that the unlocking 'token' is less likely to get lost than the bracelet, etc. But that does bring up another good point, that some of the common biometrics like fingerprints wouldn't work since many people wear work gloves.

Although, it would provide a good large-scale proof of concept for smart gun tech if it worked the same as the proposed smart gun tech.