- No display the parameters V, Hz and contrary to what is stated in the characteristic data by Amazon. - Display of 2 tariffs with 3 decimals then so be 4. The error is, however, minimal. - More annoying: there is no internal clock is no possibility of automatic change of price HP-HC according to the ERDF hours. - Taking into unintuitive hand and clear instructions not really use. - Pros: for a device connected to the jack, displays the power demand (W) and consumption over time (kWh) are correct and remain in memory.