The OR500LCDRM1U uses Automatic Voltage Regulation (AVR) to correct minor power fluctuations without switching to battery power, which extends battery life. The Smart App LCD OR500LCDRM1U comes with a three-year warranty https://garafour.com/product/cyberpower-smart-app-lcd-6-outlets-500-va-1150-j-black-cypor500lcdrm1u/