I have used the slider very little, but I have some observations that could help the user a lot. You should include lights that indicate the capacity of the battery, as well as make it clearer to know when it is already charged. This could be included in the app, so we would not run out of energy. I would also like a live view to be included in the app, to better define the start and end point. In addition, you could seek an agreement with an application or developer to include the direct option of thetering, such as Capture One or Lightroom or Zerene. When I have more use of the slider, I could give an opinion again.