Sold as 1 Each. Battery backup provides ample time for an orderly shutdown of connected equipment. Liebert PSI5 UPS operates at a high 0.9 output power factor. Available network communications card provides remote monitoring and power management capability - Local USB or SNMP via optional Vertiv Liebert UNITY communication card. Liebert PSI5 UPS is compliant with the Restriction of Hazardous Substances Directive (RoHS).