EA-600H Series Pure Sine Wave Line Interactive UPS (1kVA-2kVA) - Long Backup Time Model. This UPS is designed for connecting external batteries to extend backup time. It features automatic voltage regulation, protecting your equipment from damage caused by voltage sags, overvoltage, and surges. In the event of a power outage, the UPS will immediately switch to battery power, providing you with sufficient time to save your work or safely shut down your devices.