Bump N Grind is just what a girl needs for a special night. It's texture helps intensify the vibrations produced by the powerful and quiet motor. Twist the dial on the bottom to control the speed of the vibrations. It's also waterproof so you can take it in the shower with you. Requires 2 AAA batteries. Length: 6.25 inches. Insertable Length: 5.5 inches. Width: 1 inch. Circumference: 3.75 inches. From Blush Novelties.