Dogae - Men's Booster Pump Growth LengthThe pump can create vacuum suction to accelerate blood circulation in the men's body, thereby promoting bigger, stronger, and longer erections of the body. The suction power of this electric pump increases gradually. Novices can start training from the lowest setting first and gradually increase the training intensity. You can see the status of your body under different suction powers. The transparent sleeve is marked with clear scales. , you can also