Like the earlier model, the "Smart" portion comes mostly from its integration with iOS. As long as the case is plugged in, you'll see its battery status on both your lock screen and in the Notification Center. You still have a Lightning port free for either wired charging (including fast charging if you have the right USB-C gear) or accessories like headphones.

The case is available in black and white hues and costs $129 regardless of whichever iPhone you use. While that's not a trivial price, it might be justifiable if you need extra juice and want the perks that come with an official solution.