As promised, let’s dive back into that shiny new keyboard! Despite the update, it remains a tough nut to crack, but the trifecta of heavy-duty suction, isopropyl alcohol, and patience pays off.

The Touch ID key may look like an ordinary keycap on top, but the undercarriage looks very similar to an iPhone 7 Touch ID sensor.

What happens when you swap keyboard Touch ID sensors? They connect just fine and register Touch ID key clicks—but alas, don’t want anything to do with our fingerprints. Each Touch ID sensor seems to be paired to its original keyboard.

That's not a total surprise: Touch ID sensors have been cryptographically paired to their original hardware for years. But these Touch ID peripherals are new, so we kept testing:

Two iMacs, one keyboard: once a keyboard is paired to an iMac, it must be unpaired in order to be paired to another iMac. Unpairing a keyboard invalidates the Touch ID profile stored on the iMac, even if it's re-paired to the same keyboard later on.