Upgrading the MFI-rated accessory program, Apple now allows third-party companies to design accessories for Apple products that add USB-C slots and convert 3.5mm jacks into Lightning cables.
Since Apple only included USB-C slots in its new notebooks, extra equipment was needed for older accessories to be used in these devices. Third-party companies that develop accessories for Apple products will now be able to use USB-C docking stations and offer Apple-approved accessories while developing accessories such as controls, battery cases and speakers.
However, Apple's new MFI regulations put many restrictions on third-party producers. For example, it is forbidden to develop products that charge iPhone or synchronize the phone with other devices using USB-C docks.
The devices that convert the 3.5mm jack-in to the Lightning cable, which can be produced by third-party companies, will also allow older headphones to be used on the new iPhone. However, Apple still does not allow the production of accessories that convert Lightning cable to a USB-C cable, and it continues to retain its production right.