The PDX ELITE Suck-N-Pump Stroker features a medical-style pump ball that functions as an erection pump in one position and as a masturbation stroker in a second position— double the performance options of an ordinary pump! Penis Pump - With each squeeze of the medical-style pump ball in the Pump position, a super-strong vacuum is created inside the chamber, forcing your erection to quickly expand its length and girth. Masturbator Stroker - When the pump ball is placed in the stroker position, your shaft is surrounded by super-tight oral sex suction. Twist the top dial to activate powerful multi-speed vibrations for additional stimulation. The soft TPR sleeve forms an air-tight seal against your skin, creating incredible suction and amazing results, while the crystal-clear tube is designed for a firm grip and has a convenient ruler to gauge your expansive growth. You can instantly relieve pressure by pressing the air release valve above the pump cylinder. Features: Powerful Vibration Ruler-lined clear cylinder Stimulating Sleeve Air-Tight Seal Waterproof