A mini-tower Ups with line interactive topology, the CyberPower Intelligent Lcd CST135UC provides battery backup (using simulated sine wave output) and surge protection for desktop computers, workstations, networking devices, and home entertainment systems. The CST135UC uses Automatic Voltage Regulation (AVR) to correct minor power fluctuations without switching to battery power, which extends battery life. AVR is essential in areas where power fluctuations occur frequently.Two Usb charge ports (one Type-a and one Type-c) power portable devices such as mobile phones and tablets, even during a utility power failure. The CST135UC comes with a three-year warranty (including coverage of batteries) and a $500,000 Connected Equipment Guarantee.Battery BackupSupplies power long enough for equipment to properly shut down when utility power fails. Helps prevent loss of data and minimizes the component stress caused by a hard shutdown.