https://wccftech.com/ipad-air-4-power-button-touch-id-incredible-feat/

The iPad Air 4 became the first tablet from the company to employ the use of Touch ID in the power button. If you may have noticed, the iPad Air 4's design is significantly different than the iPad Air 3, with slimmer bezels meaning that Apple would either have to switch to the more expensive Face ID or incorporate a different security solution. With the decision Apple took, the tech giant's executives talked about the power button Touch ID of the iPad Air 4 and were nothing short of praises.

Apple’s VP of hardware engineering John Ternus and Apple’s VP of product marketing Bob Borchers talked about the change present on the new iPad Air 4 when they were asked to join the iJustine and Jenna Ezarik podcast called Same Brain. The podcast was published on Saturday, with Apple’s employees talking about the change and how it was an incredible feat of engineering to get a fingerprint sensor sporting all that security prowess into a form factor that’s minute in size.