When I give talks to kids, I always point out that when calling 911 on a cell phone, be sure to give them the phone number you're calling from if you know it and as much information as possible about your location, because if you are in a rural area like we are, we do not have enhanced 911 yet for cell phone capability.
I also ask them about seat belt usage, bicycle helmet usage, etc. to touch on personal safety issues. I show them the inside and outside, including compartments, and some of the equipment, and talk about how when they call 911 that we are coming to help them, and that they shouldn't be afraid.
Usually by the time I talk about all of that, and let them ask a few questions, that fills up about a half hour.