The Vibrating Oro Simulator measures 6 1/2 inches in length and features a latex expandable sleeve for enhanced fit and comfort. Powered by a California Exotics battery pack, this device delivers a stimulating experience that mimics the pleasures of oral sensations. Simply add a drop of lubricant inside the sheath to enjoy the smooth, sliding feel of a tongue and lips. Please note that it requires 2 AA batteries (not included).