Rechargeable automatic pump with incredible suction at the push of a button. Ultra flanged base for secure seal. Easy grip controller for single handed use. Removable, body safe Silicone donut for comfortable use. Quick air release button. Clear cylinder with incremental measurements. Easy push button control. Disassembles for easy cleaning. Ultra Soft and cushy dual Silicone ring help maintain and strengthen erection. Instructions included USB rechargeable, charging cord included. Complete charge in 2 hours. Total run time 3 hours. Dimensions Cylinder 8 inches by 2.25 inches. Donut 2.75 inches by 1.25 inches. Ring diameter 1 inch. Overall ring 2.75 inches by 2 inches.