BME founder Shannon Larratt was interviewed by io9 about the grinder/biohack movement:
Making a wristwatch implant would actually be quite simple. The electronics need to be as small as possible of course. Even though implants can be quite large (a single double-D breast implant has more volume than many laptop computers at this point), if the implant is kept thin it will be inconspicuous, perhaps even undetectable without touching it. So the wristwatch would be built with surface mount components in a tight package. The LEDs would easily be visible through the skin — it’s quite possible that some small backlit panels could be visible through the skin but simple round or bar-shaped LEDs would be my choice for a watch.
One could do a numeric display, a geeky binary display, or even just use a single light and flash the time with morse code. You’re probably not going to leave the light on all the time in order to preserve the battery, but triggering could be accomplished in many ways. An accelerometer could be used to trigger it with a specific arm motion, a pressure switch could respond to touch, or in my case, or a magnetic switch could respond to me waving my finger over it — there are many options, but whatever is chosen would have to be versatile enough to also allow the time to be set.
Finally — and this is the biggest issue — there’s power. You could have yourself cut open have the battery replaced — but there’s no need for that. Inductive charging is easy to build, and wireless chargers are commonplace these days — personally I would include such a circuit.
The Verge did a short documentary, and a piece of long form, participatory journalism, on the DIY transhumanist/bodyhacker/grinder/whatever movement:
The boys from Grindhouse Wetwares both sucked down Parliament menthols the whole time we talked. There was no irony for them in dreaming of the possibilities for one’s body and willfully destroying it. “For me, the end game is my brain and spinal column in a jar, and a robot body out in the world doing my bidding,” said Sarver. “I would really prefer not to have to rely on an inefficient four-valve pump that sends liquid through these fragile hoses. Fuck cheetahs. I want to punch through walls.”
Flesh and blood are easily shed in grinder circles, at least theoretically speaking. “People recoil from the idea of tampering inside the body,” said Tim. “I am lost when it comes to people’s unhealthy connections to your body. This is just a decaying lump of flesh that gets old, it’s leaking fluid all the time, it’s obscene to think this is me. I am my ideas and the sum of my experiences.” As far as the biohackers are concerned, we are the best argument against intelligent design.
Neither man has any illusions about how fringe biohacking is now. But technology marches on. “People say nobody is going to want to get surgery for this stuff,” admits Cannon. But he believes that will change. “They will or they will be left behind. They have no choice. It’s going to be weird and uncomfortable and scary. But you can do that, or you can become obsolete.”