Penis pump is easy to use with unparalleled suction. Stretchy and comfortable silicone enhancer included. Designed to slip easily from the base of pump cylinder to the base of the shaft. Features fully automatic pressure control, auto start/stop, quick air release button, hand-held controller with push button controls, textured grip, an oversized cylinder with universal measurements, and a flanged base for a secure seal. Easy to read LED display measures PSI vacuum. Requires 4 AAA batteries, not included. Cylinder measures 10 in. by 2.5 in.