A Student team at Johns Hopkins University has built a voice-activated exoskeleton arm and hand for a disabled man. The device was built for less than $8,000. The exoskeleton itself is a plastic structure that can slide on over the disabled arm. Suprisingly, the students selected stepper motors as the motive force. Power comes from a belt pack containing lead-acid batteries. The completed exoskeleton allows the man to grip and lift common household objects.