These are on sale for 19$ (normally 119$) and it will allow you to hookup your XLR mic to your iPhone or iPad and still use your headphones (with a 3.5mm jack)
It works great and makes it a lot easier to record on those devices.
Just used it to make a bunch of TikTok duets from my iPhone https://tiktok.com/@jhvavoiceacting
Gotta sneak that shameless self promo in...
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