It really heats things up! The Hot Rod system is a unique vibrator made to create a warming life-like feeling. The Hot Rod includes a 7" plastic multi-speed vibrator wand and a heating pack sleeve that fits around the wand. Once you have wrapped the heating pad around the wand, you pull the soft life-like penis sleeve over the vibe. You will instantly feel the vibe warm in your hand. The full diameter of the Hot Rod is 1.5". The best part is the Hot Rod is reusable so you can heat up your passion anytime it gets cold. Requires two AA size batteries, not included. A true innovation and exhilaration!