Simply insert the penis into the transparent cylinder and quickly and comfortably create a powerful potency vacuum with the special two-finger pump handle. This causes the penis to swell to an impressive size and provides a pleasurable tingling sensation. The negative pressure can be precisely controlled and varied using the pressure gauge with a pressure regulator, and the measurement scale indicates how much the penis has "grown." The cylinder is approximately 30 cm long and about 22 cm deep, with an inner diameter of approximately 6 cm. It features a soft, silicone-like sleeve.