SK2 Series UPSs feature built-in Automatic Voltage Regulation, which saves battery power for deep sag situations when input voltage is below 78V. Intelligent battery management and hot-swappable batteries that do not require shutdown for replacement are part of the SK2 design. An automatic bi-weekly test function insures the capability of the battery to supply power in emergency situations. S2K UPSs are available in 120VAC and 230VAC models, with power rating from 300VA through 1000VA.