I popped the little mini slider out so it was not in the way. It is plastic and fits into a small track on the left mobile device clamp and holds the cable in place when connected to your phone. It will clip back in quite easily. My mini iPad 4 fits perfectly and sits right against the controller like a phone would. It is a tight fit but does not feel like it is stressing the mobile device clamps, just go slow. My iPad does not have a data plan, I tether it to my iPhone and don't seem to be having any data issues. I am connecting the iPad to the controller with a lightning/USB cable.
Pretty happy with the set up. I hold the controller with the palms of my hands against the mobile device clamps, 2 fingers under the iPad, one under the controller, and the index finger and thumb operate the joy sticks and buttons. Very comfortable, controls are all in easy reach.
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