The problem
A wearable mount has to be light and comfortable, hold securely through running or sport, and still come off quickly. Conventional magnets force a choice: big enough to hold during exercise means too big or too sticky to remove easily.
How coded magnets help
Correlated Magnetics Research's home page names wearables as a fit, citing quick connect and disconnect with automatic alignment. Its published example is the OnYou armband for iPhone 6 and 6s, announced at CES 2016. CMR's release says traditional magnets were either too big or too weak to give both a secure fasten and an easy twist off, and that a custom Polymagnet let the phone snap on, stay secure while running and release with a twist. OnYou described the system as using electronics-safe magnets.
The behaviors that matter here are attach for holding force in a small size, align for landing the device in the right orientation, and twist-release so removal does not need a hard pull.