This is really a neat little gizmo. And it could maybe save your life or someone else's one day. We hope that that never happens, but if it does you will be ready.
This little thing is called a ResQMe. It is made here in the good old U.S.A.
It is small and compact. It fits on your key chain. On one end you have a tool for breaking window glass in your car. It will not break windshield glass. It is made for the side windows. Place it in the corner of the window and push it 'til it snaps, then you have broken your side window to exit your car if you can not get the door open.
It also has a built in blade for slicing through seat belts. (I saw a demo and it went right through the seat belt like soft butter.) There are directions on the package.
I bought two. One for Kathi, and one for myself. It is a neat little item that I think every one should have. It is better to have it and not need it than to need it and not have it.
I bought ours at ACE hardware. So check it out. And be safe.