His Prostate Training Kit has everything he will need. Includes a powerful multi-speed stimulator. A superior silicone pinpoint probe with curved base for comfort and fit. A solid sturdy silicone beaded probe with retrieval loop. Silicone prostate probe with support ring for the ultimate support plus stimulation. Slip the stimulator into the retrieval loop of beaded probe for reverberating vibrations. Requires 2 AAA batteries. From Cal Exotics. Stimulator: 2" X 1". Probe: 4.75" X 1". Beaded Probe: 4" X 1". Probe with Ring: 3.5" X 1.5". Ring Diameter: 1.5".