A set of user friendly, ultra pleasureale vibrating nipple clamps made just for men by the hardy Colt line, the Grips provide superior pressure agasint these often-overlooked erogenous zones. The fit of the silky, firmly precise grips can be perfectly customized by twisting the pin underneath, which varies the amount of space between the two points of each clamp. At the base, you'll find the soft touch push button that starts up the vibration, it vibrates the entire body of the Grip for intese stimaultion along with exciting pressure. Each clamp is about 2 3/4 inches long, and requires 3 LR44 cell batteries, for a total of 6 needed to power both. Batteries are included, along with a set of extras. Phthalate free. Waterproof.