Feasibility of a switch that turns on a GPS transponder and automatically dials a phone number?

I'm wondering how difficult it would be to make a gizmo that you could rig to a container where if you opened the container it would turn on a GPS transponder and place a phone call to a dedicated number?

If that's doable how long would you be able to leave something like that on "standby" (like could it stay charged for days or for months?)