Apparatus for transcutaneous electrical nerve stimulation in humans, comprising a housing； stimulation means mounted within the housing for electrically stimulating nerves； an electrode array releasably mounted to the housing, connectable to the stimulation means, and comprising electrodes for electrical stimulation of nerves； control means mounted to the housing and electrically connected to the stimulation means for controlling the stimulation means； monitoring means mounted to the housing and electrically connected to the stimulation means for monitoring the stimulation means； user interface means mounted to the housing and electrically connected to the control means for controlling the stimulation means； display means mounted to the housing and electrically connected to the control means and the monitoring means for displaying the status of the stimulations means； and a strap attached to the housing and configured to hold the housing, stimulation means and electrode array at a specific anatomical location to treat pain.
