The device features 4 electric and 4 pneumatic functions as it tries to represent a model of a human arm. With palm included, this would have as much realistic functions as possible while being of more or less accurate size. It may look like a regular robotic arm from a distance, as shown in the image below, but it can be seen from close up that this robotic claw is made entirely of LEGO. An external pneumatic compressor with an air tank is used to feed electric power through the hoses in order to replicate the human movement. There are 3 PF medium motors, one PF XL motor, and one RC motor used in making this robotic arm.
The four movable fingers have two joints each as well as a thumb which can be bent and raised or lowered. This provides the manual agility of the whole device as the 4-motor, 4-valve pneumatic hand goes through the full range of hand movements from moving joints to rotating wrists. Any object can be gripped and thumbs up can be easily given as seen in the video below:
From the images below, the most complex part of the arm is the palm. The index finger was operated independently and it is possible to operate every finger individually by taking two times more pneumatic hoses which were already quite numerous. In this case, 8 hoses are going through the arm.
Although it has not been tried, the palm can be theoretically rotated through full 360°. More images are shown below where the whole arm can be seen to be heavy but can still function well.