The CyberPower Standby CP350SLG uninterruptible power supply (UPS) safeguards PCs with non-Active PFC power supplies and other electronics (monitors, cable DSL/ modems, VoIP routers, fax machines, and home theater equipment) from blackouts, brownouts, surges, spikes, sags, and other power abnormalities. Its composite integrated circuitry offers advanced lightning protection.