Work alone, safely

DO you have a work that has be done at night and alone? This might be some frightening and maybe would you feel safer if you´d have a lone worker alarm that might warn someone else if you are in danger? This is really a good system and something that is really practical. I do also believe that one should do what they can to provide enough information to be able to protect oneself from predators, yes this is important. I do also think that it should be done in the proper way for all of the ones that work night time and so being able to do this safely.