Cyberpower Pfc Sinewave 900Va Line Interactive Tower Ups 540W Lcd Display 2X Uk. CyberPower CP900EPFCLCD-UK with Pure Sine Wave output safeguards mid- to high-end computer systems, servers and networking hardware that use conventional and Active Power Factor Correction (PFC) power supplies. Designed with GreenPower UPS Technology to improve operating efficiency and to minimize energy consumption, this UPS delivers significant energy cost savings over conventional UPS systems.