iStim PR-13: Premium cylindrical and slimline design is made for easy insertion and comfortable feeling during stimulation. A sliding end-stop allows users to adjust the depth of insertion: shallow for anal sphincter, and deeper for pelvic floor. Can be used with incontinence EMS machine to help with the relief of incontinence and train the sphincter muscle. KEGEL EXERCISE: A simple clench-and-release exercises that makes the muscles under the uterus, bladder, and bowel (large intestine) stronger. iStim Probe was designed to help the incontinence sufferers to operate the automatic KEGEL EXERCISES. By connecting iStim PROBE with incontinence EMS machine , the automatic KEGEL will get started! APPROVAL: Safe, All-Natural, Drug Free and Long-Lasting Incontinence Relief. 510K approved for OTC use and safety regulations (IEC60601-1, IEC60601-1-2 EMC) certified. PRODUCT SET: iStim PR-13 Probe x 1; Quick Guide x 1; Zip-Lock Carrying bag x 1 NOTE: The package doesn't come with EMS machine.