This is easily the smallest controller I ever used, and while I initially thought it was gimmicky, that isn't the case now ...
There are tons of Bluetooth controllers on the market ... In order to support as many phones as possible, the controller ships with two 2.5mm discs that are embedded with MagSafe magnet arrays.
With the controller attached, phones remain compact enough to carry in jeans. When it's time for gaming, a launch button flings phones above the controls. Operating using Bluetooth, the MCON works ...