You're right az3579. Just did the research I should have done before. CNET said:
A Lightning-to-3.5mm dongle
Let's get this one out of the way first, because it seems to draw the most ire from readers. Apple thankfully includes a Lightning-to-3.5mm adapter in the box to make the iPhone 7 and 7 Plus compatible with "legacy" headphones. The catch is a single-port dongle means you can't charge the phone and listen to music at the same time, but guess what? Belkin already released a $40 Lightning splitter to solve that problem, too.
Aux cable may be the easiest route.............