APC, Part #: BK500EI APC Back-UPS CS 500 - 500VA/300W - 2.4 Minute Full Load - 3 x IEC 320-C13, 1 x IEC 320-C13 - Battery/Surge-protected, 2 Marketing Information:APC Smart-UPS protects your data by supplying reliable, network-grade power in either traditional Tower or Rack-optimized form factors for space constrained business critical applications.