The Osaki Twister: Glow in the Dark is a Multi-Speed Stimulator with Slide Action Control for Multiple Variations of Vibrations and Rotations, and a Flesh-like Texture that Warms to the Body! The Osaki Twister: Glow in the Dark has Dual Vibrating Motors…One near the Top of the Vibrator to provide Pulsating, Twisting Pleasure…and the other in the Beaver for Pleasing Tongue Action! Uses 3 `AA` Size Batteries (not included)