This penis pump provides four suction modes with gradually increasing suction levels, ranging from 0-35, 35-40, 40-45 and 45-50. You can flexibly adjust the intensity and frequency of suction according to your own needs to achieve the best comfort experience and effect. In addition, the male sex toy design is equipped with a transparent cylinder and clear scales, so you can easily observe changes during use, ensuring that the use effect is more significant and satisfactory.