Mophie, makers of some of the most popular smartphone battery cases and packs, has a new $40 battery case called the Power Capsule (hey Mophie, stop using lowercase for all your product names…) designed for charging up wireless headphones and wearables like fitness trackers and smartwatches.

The Product Capsule is essentially a soft-shell case with a 1,400 mAh battery. Storage and integrated power. And like all Mophie batteries, there’s a battery LED indicator on the bottom to show you how full it is.