Consider the use case of an authentication token. I would use a watch for unlocking a phone, password manager, or laptop.
However, Bluetooth and a monochrome LCD would get the job done just fine.
However, Bluetooth and a monochrome LCD would get the job done just fine.
Though it's worth noting, with August and Lockitron keyless entry systems being shipped this year, I wonder if the same can't also be accomplished with the existing BLE implementation by Pebble/others