Invented by Dan Didrick of Naples, Florida, the device has NO batteries, electronics, servos or actuators. Instead, each digit incorporates a simple mechanism which, when pushed by the surviving part of the wearer's finger, curls a set of artificial phalanges. The finger, however, is only the beginning. Didrick is already working on an entire hand articulated in similar fashion using the wrist, and has been approached to craft toes using the same principle.
Watching inventions like the Robotic hand or Bionic arm (related posts), there is just way too much technology involved in comparison to this product. So enlightening: less technology is certainly more in this case!