1000 VA / 800W Pure Sine Wave UPS Battery Backup Smart-UPS Extended Run Option: Extended run models accept external battery packs (model SMX48RMBP2U, sold separately) for a longer runtime, to power critical servers, security, and comm. systems through prolonged outages Input: NEMA 5-15P. Output: NEMA 5-15R (8) Tower. 2U Rackmount convertible (rail kits sold separately, part# AP9625)