Penis pump is easy to use with unparalleled suction. Features fully automatic pressure control with the push of a button, auto start/stop button, quick air release valve, and ergonomic hand-held controller. Easy to read LED display measures PSI vacuum inside the yextured grip, oversized cylinder with universal measurements. Flanged base for a secure seal. 10 in. by 2.5 in. cylinder. Requires 4 AAA batteries, not included.