Easy-to-use with unparalleled suction. Stretchy and comfortable Silicone enhancer included. Ring is designed to slip easily from the base of pump cylinder to the base of your shaft. Fully automatic pressure control with auto start/stop. Quick air release button. Ergonomic hand-held controller with push-button controls. Easy-to-read LED display measures PSI vacuum inside cylinder. Textured grip, oversized cylinder with universal measurements. Flanged base for a secure seal. Body safe donut.