An excellent UPS powerful enough to support a heavy configuration without problems. He incidentally protects electrical devices and even the telephone line of storms and has many taken with French standards (classified into several categories and allowing selective if necessary stops the material). The breaking test that I conducted (by disconnecting the UPS from utility power) proved entirely satisfactory (only perform this test after charging the batteries - I just waited one day for me). My saved configuration includes a muscular PC, screen, a sound system 5.1, a Livebox and telephone. The device is connected to the PC via USB port. Installation is pretty simple - I have used it as the instructions on the carton (anyway record is unnecessarily abstruse). Note: The pack includes a CD (completely unnecessary) that can be cast without problems. This inverter is sufficient in itself without this program whose functions are nebulae (For my part I have not even managed to start! Something for pros?) A final positive note, the batteries are easily removable (very long term, it has the possibility to change).