The ELB Night Vision Prototype 85 was a prototype helmet developed by Emmett Brown in 1991. It allowed the DeLorean time machine to be driven in the dark, without using headlights, by employing night vision technology.
When Verne Brown traveled to February 11, 1864, he arrived at night. As he didn't have the headlights on, the helmet of the ELB Night Vision Prototype 85 lowered over his head. This frightened Verne, and he crashed into the camp of Confederate General Beauregard Tannen.