|The following is based on Fallout cut content and has not been confirmed by canon sources.|
“An electronic transmission device, with a very simple, and large, toggle button. It looks like it was recently made and designed for very large hands.”
This toggle has a small radio emitter and a tiny power cell. It probably links to a control computer somewhere, as an on/off switch. This toggle can be used to toggle on/off the force fields on levels 1-3 of Mariposa Military Base.