eSaver's core product is a special transformer with high power density and small size. eSaver works according to a unique principle and thus has significant differences in technology and economy compared to other energy-saving devices available on the market. By saving a substantial part of the power loss, the investment no longer takes priority because eSaver finances itself by reducing operating costs. The transformer of the eSaver has a considerably smaller size compared to conventional transformers, so that even large outputs can be realised with a smaller size. In order to keep the entire power supply network stable, the network operators supply an overvoltage that is significantly higher than the required useful voltage for consumers. This ensures that the voltages lie within the tolerance limits even in the furthest corners of the country.