2000 VA / 1800W Pure Sine Wave UPS battery backup Smart-UPS Extended Run Option: Extended-run models accept external battery packs (model SMX120BP, sold separately) for a longer runtime during prolonged outages, to power critical servers, security and communications systems Input: NEMA 5-20P. Output: NEMA 5-15R (6), 5-20R (3) and L5-20R (1) Pre-Installed Network Management Card with environmental Monitoring (APC model AP9631) Output: 120V (User-selectable 100V-127V) Tower. 4U Rackmount convertible (rail kits sold separately, part# AP9625)