Customize your workout with this vibrating enhancement pump system with 10 functions of vibration, pulsation, and escalation. Features include a seamless cylinder with incremental measures, quick-release push button purge valve, flexible silicone air hose, and a silicone sleeve that holds the power pack and bullet for hands-free use. Cylinder is 8 in. by 2.25 in. Requires 2 AAA batteries.