13X Auto Milker Intense Sucking In Pakistan Nubbed Interior Tunnel: Stimulate Your Shaft With Soft, Stretchy Nubs As You Stroke! Manual Or Automatic Suction: You Can Enjoy Suction In Two Different Ways. The First Is To Press The Manual Button That Looks Like A Finger Pointing To A Circle. This Allows You To Enjoy Steady, Continual Suction Until You Release It. The Second Way Is To Press The Automatic Button Which Looks Like A Little Tornado Made Of Circles. Each Time You Press This Button It Cycles Through 3 Different Sucking Modes.