The HAL is controlled by the mind. Yes you heard correctly. Unlike the Rex, the Human Assisted Limb (HAL) taps into the signals sent by the brain (however weak), to move the exoskeleton.
Unfortunately, HAL is only available for hospital rehabilitation. Hopefully this incredible product will soon be available for home use.
HAL actually rewires the brain to strengthen the brain signals to accelerate a motor neuron learning of the cerebral nerves.