People who work in production or in the field are in a working environment where it is difficult to have a personal PC in the office. As I moved around and worked according to on-site conditions, I moved to a separate, designated office space to apply for leave and overtime. Now you don't have to. This function is available on your personal smartphone in your pocket via mobile. In the past, in order to do this, the shift leader would apply for vacation and overtime on my behalf. Now I can apply personally. In addition, when moving to an outside office or commuting from a dispatched work location, you can clock in and out through this app. You can only go to work and leave work at the GPS location designated in advance by the company. It's a great app that can do these things.