The battery generates a mild, electromagnetic field at the tip of a long wire, connected to the small battery pack and emits electrical pulses to the superficial nerves in the forehead and back of the head. Headache pain is then replaced with a tingling or massaging sensation almost instantly. Medical studies show that while the device is stimulating the superficial nerves, it is also stimulating deep centers in the brain related to the areas important in the modulation and genesis of headaches. Thus, the neurostimulator works in a very safe fashion to stop or prevent headaches from occurring altogether. For patients who positively respond to the trial procedure and move forward with the permanent unit, the response is dramatic and results are often immediate.