I really like this idea, Im actually surprised Apple did not build it into the watch. The problem is that the phone can be in my hand or on the table in front of me within arms length or in my pocket and its constantly notifying me that the watch is out of range. After five days of that, it just wasnt worth it so deleted the app. By the way that was at the lowest setting.
Bburke4371 about F-Secure Mobile Security