Pump Rechargeable Vacuum Penis Pump allows you to boost your stamina and take control of your sex life. Penis pumps are an effective method of easing the symptoms of ED as well as a way to explore size and firmness. With 7.15 pounds of force per square inch, get ready to enjoy thicker and harder erections. Simply press the suction button for 5 seconds of vacuum power - press again to receive 5 more. Continue pressing as you watch your penis grow until you reach your desired erection. One Year Warranty.