Sinclair Endow Vacuum Pump System. Overcome erectile problems with vacuum pressure therapy system that is included with two operating modes: an ergonomic hands pump along with a battery powered pump. Interact with the two inch cylinder, slide the penis in and pump to engorge you penis to the maximum capacity, hardness and size. Group of 4 constriction rings keep up with the erection for approximately half an hour. Includes 2 pumps with quick release valve, 10 inches lengthy by 2 " wide cylinder, removable gasket, connecting tubes, 4 constriction rings (.5 " to .75 inch ), use and care directions. This pump works with water personal lubricant. It's not suggested for use with silicone lubes. After use, carefully wash the pump with mild water and soap or consider using a adult toy cleaner for faster cleanup. Store this pump individually using their company adult sex toys