Originally published at: Apple Updates AirPods Pro with USB-C Case and Improved Dust Resistance - TidBITS
If you’re making the jump to USB-C, Apple has updated the second-generation AirPods Pro with a USB-C charging case (and a few other minor changes). The company also released a USB-C version of the wired EarPods.
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“to ground Lightning” Hehe. 
Well played, Sir.
In my own personal crusade to rid my home and office of Lightning, I’ve also added a set of replacement Air Pods Pro to my iPhone 15 order. My original APP were a hand-me-down from my wife who didn’t like the pressure. They were ordered right after launch so the battery health there too had declined. The new ones will restore that. 
To my surprise, both APP and iPhone 15 were still scheduled to arrive by next Fri, my baseball engraving personalization notwithstanding. 
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Holy cow. Both were just charged to my CC. And Apple Store status went to preparing to ship. This is moving a lot faster than I expected.
Edit: I see this is happening on a much broader scale actually. Kudos.
“ IP4”? Is that the same thing as IPx4? Cos IP codes should have two digits (where x is a placeholder for an unevaluated property).
“IP4” = IPx4, yes.
They are IP54, to be pedantic.
I agree with Simon—I was perturbed by the single digit as well in the move from IP4 to IP54, but as far as I can tell, when there’s only a single digit, it means water resistance.
There’s a good chart of IP codes here. The first location is for dust resistance. ‘x’ means that it wasn’t tested; ‘5’ is the 2nd highest rating for ingress protection, loosely called ‘dust-resistant’.