The stimulator or control unit contains the microcomputer, the software (firmware) and associated electronics that generate the electrical impulses, control the intensity of the stimulation and activate all functions. Keys on the keypad allow the user to increase and decrease levels of stimulation to the muscles of the lower extremities for standing and step-taking. The stimulation intensity level is displayed by a 10-bar light emitting diode (LED) panel on the side of the unit (see photos).
