Given some refinements in design, they estimate it may be possible to convert enough energy such that the harvesters alone would be sufficient to power all of the implants in the cyborg beetle.
Sadly, Pebble won't be making its way to backers by its original September estimate, but the design team wants you to know that it's hard at work, traveling the world to source components, running shipping tests and spending time refining the user interface in order to provide a top-notch experience once you do receive your device in the mail.