So how it works is that the servo motors (which you will learn about in an upcoming upgrade) pulls each tender or string and there are little cut's in each finger and when the servo motors pull the tender, it will bend a finger. To control it, you have a whole control panel in the back! And if you are wondering why I made this, it is for an event called robotics week at a store called "You-Do-It electronics" and I made it to show of.