A system is provided for a Transcutaneous Electrical Nerve or Electrical Muscle Stimulation. The system generally includes at least two electrodes carried on a single substrate adapted to be disposed in electrical contact with a body surface, and an electrical stimulation unit configured to deliver electrical pulses to muscle groups or nerve endings adjacent a body surface that is in electrical contact with the at least two electrodes. The electrical stimulation unit includes an on-board controller configured for controlling the stimulation unit to deliver electrical pulses for pain relief and/or muscle relaxation.