Our headlamp works because we first but a little thing that had to be connect to the headlamp we use two wire to make it work one was red and the other one was blue we had to put metal in them to make it work was we were done we put batteries to turn them on. The building probably took two to three days to make the headlamps but the actual learning took about a maximum of two weeks. We all use our headlamp in into the wild to go to places that are dark.