With the removal of 3.5 headphone jack off the Iphone 7 and probably all future Apple products. You are limited when you want to use regular 3.5 headphones or if you want to charge, and use your wired headphones at the same time.
You are also limited, if your car has a 3.5 AUX headphone jack to bring audio in, but your iphone now does not have a 3.5 output. How do you do this? Below are some products to solve this problem, and it may be cheaper than any Apple solutions — longer cables means it is less likely to be lost over Apple products.