The video and the invention is truly amazing.

According to the Naples Daily News:

The prosthetic is designed to do the same work as a real finger. It can bend down, point forward and even wag back and forth. The finger can even support the weight of a full cup of coffee or clutch a golf club.

The X-Finger is kind of like a tinker toy that is strapped to the stub or remaining portion of a finger. When the stub moves down it pushes against a lever called a pan that curls the artificial knuckles.

"There’s no learning curve," Didrick says, as he straps on one of his devices on his own index finger. As he curls the tip of his index finger, the X-Finger curls in-step.