The Liebert PSP UPS is a standby UPS design with a Step Wave output. Each unit has an attached 6ft. input cord with a NEMA 5-15 plug. The 120 VAC models are UL and c-UL listed. It has a USB port for communications along with Liebert Multilink Software. In addition, the Liebert PSP offers Data-line Protection via an RJ-45 Connector, user-replaceable batteries, (3) Battery backup, and single Surge output receptacles. The Liebert PSP has a standard two-year warranty, with optional 1 and 3 year extended warranties A standby UPS design with a Step Wave output USB communication port and MultiLink software Minimum of three minutes of battery runtime at full resistive Load Data-Line (RJ-45) Surge Protection.