"Alternative access to an iPad can sometimes be critical. These units are of immediate benefit in allowing those with physical and/or visual challenges to control 'switch-friendly' apps and certain 'regular' apps." RJ
Each unit also has built-in switch jacks for those physically needing switch access.
Step-scanning uses 1 button (or switch) to move your onscreen highlighter (selector, and audio preview, if you have that enabled), and another to Select. This method greatly speeds up getting to things when they are far from the upper left corner. This method also removes any timing factor which is usually required in Auto-scan.
A moderate number of special needs apps have built-in scanning abilities and most have 2 switch Step-scan as an option. Further, iPads (and iPhones and iPod Touches) have Switch Control to allow scanning *some* apps and websites. Within Switch Control, is Recipes, which allows a designated switch/button to turn the pages in a storybook or perform some other repetitive action within 'regular' apps.
This great tool for Step-scanning comes in 3 sizes:
Small, Large, and X-LARGE