I mainly use it to connect a USB keyboard to my iPhone 11 Max Pro for typing emails/texts without (heavy) bold fingering. It has the added benefit of a power connector so you don't lose it when plugging in a device. Headphones 3.5mm not tested, but my "logs"? Brand name USB headphones with a microphone arm work great on my iPhone thanks to this adapter. I really want Apple to develop a USB connector that integrates all of this. Anyone who writes a lot of text and only wants to use their iPhone as a mini laptop will love this device. This is probably one of my best purchases this year - I use it every day.
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