A cart for supporting cargo thereon has wheels at one end and a handle at an opposite end to allow the cart to be transported manually on a ground surface. A database manager in the managing device stores the generated power quantity information transmitted back from the electric power generator into a database. In the first position, the second surface of the second crystal element abuts against the first surface of the first crystal element, to allow a light beam transmitting into the first crystal element to pass through the second crystal element without substantial reflection. Controls are fully adjustable for control of onoff, pressure, sub-seat location of liquid and air delivery mechanisms, and temperature and pressure of liquids.