10 electrotherapy device for providing transcutaneous electrical nerve stimulation; electrotherapy stimulation apparatus comprising electrical nerve and muscle stimulators for therapeutic treatment of humans; transdermal stimulation patch for medical treatment and therapy; transdermal stimulation patch applied to the body to cause a cognitive and physiological effect and change a user's calmness, energy, fatigue, sleepiness, alertness, wakefulness, attention, mood, anxiety, stress, sensory experience, motor performance, sexual arousal, creativity, relaxation, empathy, and connectedness; transdermal stimulation patch for use with neuromodulation; electrical nerve stimulation device for treating chronic pain, autoimmune disorders, skin conditions, and mental health conditions