Saw a demo 20 years ago at Infosec(UK) of a company selling a dongle which with corresponding pass, acted as a proximity authentication and locking when you wal

Saw a demo 20 years ago at Infosec(UK) of a company selling a dongle which with corresponding pass, acted as a proximity authentication and locking when you walked away. Today, most laptops have cameras which can offer the same level of proximity detection if you away from the laptop. That would make this type of solution doable via software that way, albeit a bit more of a software load overhead. But for some killcord, I'd also have an alarm.