A real smart charger which optimizes the capacity and life of your rechargeable batteries. Test mode that performs a full cycle charge / discharge is recommended to optimize your new batteries (make before first use). The Refresh mode allows it to maximize the capacity of your batteries by making charge / discharge cycles as the capacity increases. This mode allowed me to recover rechargeable batteries that had become unusable as a result of loads with cheap chargers sold in major retailers of electronic products. This charger can charge an odd number of cells (in fact any number of batteries between 1 and 4) and it is possible to simultaneously load different types of AAA batteries (LR03) and AA (LR06) possibly with different intensities. Various load intensities can be used to either maximize the useful life (200 mA) or load speed (500 or 700 mA). Unrelated chargers sold in major retailers of electronic products, most of which seem to screw up the batteries in no time. The finish of the product is very good and it is very easy to use. Really essential.