Pump Rechargeable Vacuum Penis Pump allows people to boost their stamina and take control of their sex lives. With 7.15 pounds of force per square inch, they should get ready to enjoy thicker and harder erections. They simply press the suction button for 5 seconds of vacuum power - press again to receive 5 more. They can continue pressing as they watch their penis grow until they reach their desired erection. Diameter - 1.25 in (stretches to 2.5 in)