Screen resolution problem

Hey guys. I'm creating a some models in blender and import them into Unity. In Unity the Size of the model is 1x1, so I'm moving the main cam to the position where I can see the Model right. When I build the game and select different resolution's the Model isnt right. It dont move with the resolution, it will be cutted on the left and on the right. How can I fix that?

Sry for my English btw ;) Thank you.