Bottoms up! Hustler's Spark Plug will get your caboose shaking all night long! Seriously studded for a unique sensation and armed with 7 different speeds and functions. Our Spark Plug will have your engine purring. - 3'' vibrating butt plug - 7 speeds and functions - Remote control operated - Waterproof (plug only) - Phthalate free - Uses two AAA batteries (not included)