Automatic Power Pump Clear. 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 your shaft. Fully automatic pressure control. Auto start, stop. Quick air release button. Ergonomic hand held controller with push button controls. Easy to read LED display measures PSI vacuum inside compact cylinder. Textured grip, over sized cylinder with universal measurements. Flange base for a secure seal. Body safe donut. Safe and pure for body and pleasure made using phthalate free materials PC poly carbonate cylinder, ABS plastic with polyurethane PU Cote controller, Silicone hose, enhancer. 10 inches by 2.5 inches cylinder. 3.75 inches by 1.75 inches enhancer. Bulk weight 14 ounces. Penis pump requires 4 AAA batteries, not included.