The CyberPower Standby CP550SLG uninterruptible power supply (UPS) safeguards a home office PC and other electronics like monitors, printers, scanners, speakers, fax machines, CD/DVD players from surges, spikes, sags, brownouts and other power abnormalities. Its composite integrated circuitry offers advanced lightning protection, and the CyberPower Standby CP550SLG UPS's patented GreenPower UPSâ„¢ advanced circuitry reduces UPS energy costs by up to 75% compared to competitive models.