This page shows the user a list of models that can be navigated by simply scrolling up and down. It includes a back button as well as a drop down menu to easily access all pages.
Most of the models will be locked until the user purchases the premium version of the app. This is to help target enthusiasts and help raise money for the app. You can also make in app purchases of individual models to be unlocked. This is done by clicking on locked model and then this then takes you to the Apple or Android store to make the purchase.