Belkin's iPhone dongle helps you listen while you charge
 

Last year's Belkin Rockstar dongle was a lifesaver for iPhone 7 owners who wanted to charge their device while doing just about anything else, but it had a problem: with two Lightning ports, you still had to add a second adapter to plug in your favor...

https://www.engadget.com/2017/09/20/...le-you-charge/