The Short Version
Aulumu's M10 is a 10,000mAh battery pack that charges iPhones via MagSafe, Apple Watch or AirPods via a magnetic puck, and other devices through a built-in USB-C cable.
Apple sells a MagSafe battery pack that charges only your iPhone. The Aulumu M10 charges your iPhone, your watch, and your earbuds from one device. Apple's own accessory team left that door wide open, and a third party walked right through it.