This device is really easy to use, without having to read complicated manuals. Ultimately, it is simply connected electrical device between Steckdoseund. By previously inputting the electricity tariff (a look at the last electricity bill or on the website of the selected current provider is sufficient), the instrument displays the costs incurred daily, monthly and yearly. For consumers, such as televisions that do not run constantly, of course, the energy cost meter should be connected for an extended period in order to obtain a reasonable calculation. Well, I think that even after Unplugging the measured values are retained, so that there are no problems when the socket is difficult to see. All in all, a device that is absolutely justifying its price and is therefore recommended in any case. A small blemish I have yet found - I would have liked to respect the projected values on the day, month and year, had so displayed as pure power consumption not only the cost.