Lynq

First, it lasts for 3 days. WIN. It can clip to anything DOUBLE WIN, and it doesn't require a cellular connection. Take my money.

Of course this is awesome for childsafety and keepint track of pets, but if you're traveling in a busy or unknown area, I can't think of a better way to keep track of your people, up to 12 in fact.

Linq also has a 3-mile range which makes it great for active sports like skiing, horseback riding or kayaking.