The SMART1000LCD SmartPro LCD 120V, 1000VA/500W Line-Interactive Uninterruptible Power Supply provides battery backup and AC power protection against blackouts, brownouts, power surges and line noise that can damage electronics or destroy data. Ideal for backing up your desktop computer or audio/visual components, this line-interactive UPS switches to battery backup mode in milliseconds to keep your connected equipment running long enough to save files and shut down safely with no data loss. While all eight NEMA 5-15R outlets protect against surges, four outlets also provide up to 3 hours of UPS battery support for a DVR component, 60 minutes of support for a basic desktop PC and LCD monitor, and 10 minutes of support at half load (250W).