The dual bulbous probe is 5.5 long with diameters ranging from .625 up to 1.125. The hygienically superior Silicone sleeve with multiple nubbies has an outstanding Clitoral Tickler. The One Touch Activation with the Glow in the Dark Button provides seven different functions of vibration, pulsation, and escalation. The probe also has a removable plug-in power jack and the power pack requires 3 AAA size batteries, not included. The Elite 7X Sensual Obsession is a wonderful obsession!