It’s no longer a problem with the 8 series which has wireless charging. The 7 is the phone where customers really lost out as they only have one port. In fact most of my complaints about removing the headphone jack were addressed with the iPhone 8.
I’m looking for every way possible to make my experience in the car more convenient. Not having to plug a charger and an audio cable into my phone is one such improvement. Even with a headphone jack I sought to make getting in and out of my car more convenient. So I bought a $20 BT dongle that my iPhone automatically connected to when I started my car. Now that you can buy a wireless charging pad for the car, the Lightning port is completely unecessary while driving.
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There is definitely lag with those. You want to make sure you get both a transmitter and receiver that support Aptx LL. I have a matched Trond pair, which I use for transmitting audio from my TV headphone jack to my headphones, and subwoofer. Sync is tight. I tried the MPOW but they didn’t have a aptx LL receiver unit and sync was hit or miss at best.
https://www.amazon.com/TROND-Bluetooth-Transmitter-Simultaneously-CD-Player/dp/B01B4W40VC?crid=1A56ZX1HWQALH