Tripp Lite 1000VA UPS Backup, 500W Line-Interactive AVR, Tower, USB (OMNIVS1000) 1kVA 500W Line-Interactive Battery Back Up Uninterruptible Power Supply (UPS) with AVR Corrects brownouts as low as 89V without using battery power NEMA 5-15P input plug and 8 NEMA 5-15R outlets (6 UPS supported, 2 surge-only Free PowerAlert software for safe unattended computer shutdown and file saves 3-Year Limited Warranty and $200,000 Ultimate Lifetime Insurance for connected equipment