The Pulse switch position has no détente so you have to hold the switch in the Pulse position, and the motor runs continuously until released. You may as well select Medium or High speed which start the blender running until you manually select Off. During the first run I found a more serious problem: the clear plastic ‘Stopper’ atop the blender does not seal the blender ‘jug’. There are slots in it so that allow your efforts to escape into the air. I was blending for a tomato soup. I had 1.5 litres in the flask, and when I started to blend, a fountain of hot soup shot through the slots in the clear stopper. I double checked everything was sealed/seated correctly, but completed the job with a dishcloth covering the top. The latter also got a good taste of tomato soup, as did a corner of my kitchen from the first run. The manual that comes with the blender covers these points but they are not mentioned in the Amazon listing. The jug’s actual capacity is determined by what is being blended. A list of scenarios in the manual must be used to determine the actual capacity according to the liquid/solids ratio you need blending. Because of these drawbacks I will return it. Read more