IT IS A DEMONSTRATION OF HOW OUR WORK OUR SELF PROPELLED TROLLEY OX-ST-100 The ST models have direct three-phase power to the grid, without lifting cylinder nor batteries. It consists of the base of the range, being the most economical, since it must be connected to the grid by means of an electric cable. To place the load on the trolley, a supplementary system such as lifting a crane or hydraulic jacks is required. (We can also supply them). https://youtu.be/zwfA3vBU58k