Vacuum therapy is a safe and effective way to achieve a firm erection without the use of oral or topical remedies or any invasive procedure. Simply place the penis into the lubricated, medical grade cylinder, hold firmly against the body to create an airtight seal, and pump the hand held trigger. The pumping action and vacuum seal draws blood into the penis for an immediate, firm erection. After ereciton is achieved, slip one of the constriction rings around the base of the penis to maintain the erection. VTU Deluxe system comes with pump, cylinder. tubing, 4 Comfort (constriction) rings, ring removal glide, scrotal protection inserts, lubricant sample, and discreet carrying case.