CarPlay, which is Apple’s in-car infotainment system has recently starting appearing with aftermarket systems such as Pioneer and Alpine. Now, Apple has released a set of manufacturing and specification guidelines for building hardware. It will use the Made-for-iPhone/iPad/iPod (MFi) scheme.

Within the guidelines, Apple has stated that only in-dash units are permitted. Other specs such as a minimum of a 6-inch screen, with a resolution of 800 x 480 and 30Hz refresh rate. Also required is a button which is used to activate Siri.

Originally announced in June 2013 alongside iOS 7, iOS in the Car as it was then called, was rebranded and officially launched earlier this year.

All of the hardware made will go though the MFi program, this means that the product will have an authentication chip which will help stop unofficial knock-offs being made.