The unique principle of electric field therapy gives it a special killing effect on cancer cells: 1. It can treat deep tumors. The electric field therapy is non-uniformly distributed throughout the treatment area, covering the geometry of all treatment sites, and the transducer arrays are not attenuated and can therefore be used to treat tumors located deep. 2. Sustainable treatment. Since the electric field does not have a half-life, the electric field is continuously delivered during the treatment. 3. Precise targeting prevents cancer cell division. The electric field can selectively interfere with the cancer cells in the fast-growth mitotic phase that produce highly charged substances, causing them to enter the cell suicide program death, but have no significant effect on the normal cells of the quiescent and dividing phases. 4. Safe and non-invasive. So far, since electric field therapy has no effect on normal cell division, no related adverse events of electric field treatment have been reported. The main side effect is skin irritation. Prevention strategies include proper shaving, cleaning the scalp and frequent replacement of the electrode patch. When skin problems occur, it is usually possible to change the placement of the patch or using oral antibiotics, or corticosteroids. 5. Therapeutic equipment for electric field therapy. Electric field therapy consists of attaching a patient's non-invasive transducer array and an extracorporeal generator to deliver an electric field through the skin.