Power problems including blackouts, brownouts, power surges and line noise interference threaten your investment! They can damage or destroy PCs and other expensive equipment, wipe out valuable data and files, and degrade component performance. Get protected against these all-too-common power threats with Tripp Lite"s OMNI900LCD Digital UPS System. It provides reliable battery backup that can keep entry-level PC systems operational for up to 50 minutes during blackouts. Automatic voltage regulation (AVR) corrects low-voltage conditions (brownouts) back to safe 120V power without draining the UPS battery. Surge suppression and EMI/RFI line noise filtering prevent hardware damage and performance problems such as poor-quality audio and video output. A large illuminated LCD screen with dimmer switch shows incoming power conditions and UPS operations in real time.