The Vertiv Liebert PSI5 uninterruptible power supply (UPS) is designed to protect and extend the life of your electronic devices in school, home and office. This TAA compliant 1500VA UPS offers cost-effective protection from downtime and damage caused by power outages, brownouts, sags, surges or noise interference. Automatic Voltage Regulation (AVR) extends battery life. Voltage regulation is from 83 to 159 VAC without using the battery. With advanced pure sine wave output, this line interactive UPS ensures availability of critical IT applications like network closets and small data centers. This battery backup allows orderly shutdown of critical equipment. It takes less than 6 milliseconds transfer time to battery.