Shipping was fast as always. Simple Description .Tolles style. The functions on the display very helpful because you can retrieve the current power (watts). Toll is also the software what you can control the APC helpful easy installation. The hum is only in charge state or when it is running on the internal battery otherwise you can hear nothing have written, other customers .On battery voltage without delay .Habe simply removed the plug from the APC and already in the menu bar of the PC, the alarm and the display of device how many minutes you have time .OB in standby 10 watts or 15 watts consumption relevant to me, and this one has it yes that are secured over the other devices .I have brought a new PC for around 1,700 euros to me some time ago. With my old seems because of a surge the power supply to-be by carved complete and as the purchase price and the consumption is to me to be beside the point.