These models have been designed to neatly mate with the Nintendo Switch Joy-Cons to allow mobile gaming using a variety of phones equipped with a phone case. The contours of the grips match the Joy-Con contours, and the entire package can be packed away into a compact travel case.
Recommendations:
The adapters were originally designed for an iPhone 13 Pro, but with some modifications I believe the current design should be broadly applicable to most phones with cases. I can attest that the design is secure on an iPhone 13 Pro and an iPhone 11, both equipped with a MagBak case.
The author marked this model as their own original creation.