The SizeGenetics is a penile traction device designed to permanently lengthen the penis through gradual tissue expansion. It utilizes the principle of traction to stimulate cell multiplication over time. Test subjects achieved an average penis lengthening of 2.8 cm after 3-4 months of daily 12-hour use. The manual provides detailed instructions on device assembly, proper fitting, adjusting traction levels over time, cleaning, and tracking progress.