The Ultra Bator features 3 speeds of swirling rotation sensation and up and down stroking action, all in one! The inner chamber is texturized with sensation feelers, and 4 windows on the sides that let you see all the action. To use, just lube it up insert your rod, then turn on the stroker, select your speed, and let the Ultra Bator do all the work. Measures 10.5 inches in total length, 3.25 inches in diameter, 2 inches inner diameter. Requires 4 AA batteries not included.