The pen1s pump is designed to create a vacuum suction that improves the blood flow to the pen1s creating thicker, longer, and harder erections. The transparent chamber with a measurement gauge allows you to track and control the pressure with every session when you use the automatic pen1s pump. This affordable and effective pen1s vacuum pump can also be used to treat erectile dysfunction, leaving both you and your partner satisfied with the results. The insertion sleeve is made from a smooth silicone material which was designed for ease and comfort. The erection pump also has a quick release valve to ensure a safe play at all times. With 9 different levels to choose from, you can work your way up to the most intense suction for your desired satisfaction with pen1s enlargement pump.