The Reserve Strap is an Apple Watch accessory that is capable of charging the smartwatch while you wear it. Currently in prototype stage, the strap -- in its current version -- uses a direct connection to the device's diagnostic port. This allows for shorter charging times and greater charging capacity than is achievable using wireless inductive charging.
The designers at Reserve Strap have also focused on the style and fashion of their strap, as it's common knowledge by this point that even the most efficient wearable accessory won't be embraced if it's not fashionable.
With Apple having released official guidelines for straps developed by outside companies, the enterprising engineers at Reserve Strap have jumped at the opportunity to create a smartly designed strap that is both functional and fashionable.