Using the principle of negative pressure or vacuum, the penis is passively filled with blood and becomes erect, thereby treating impotence. I personally think that one of its major disadvantages is that while the penis is congested and enlarged, it also blocks the return of blood to the penis, causing congestion in the penis. During congestion, capillaries will expand and leak out due to lack of oxygen, resulting in non-specific inflammatory reactions. In the long run, it will easily cause fibrosis of the corpus cavernosum and irreversible pathological impotence. Please consider carefully before use. It’s a penis enlarger