protect Your Electronics With This 6-outlet, 120-volt Battery Backup System. 210-watt Back-ups Features A Surge Energy Rating Of 1,020 Joules. Serial Connection Lets You Use Your Pc To Access Additional Power Protection And Management Features For Your Uninterruptible Power Supply (ups) Through A Serial Port. Disconnected Battery Notification Warns You When A Battery Is Not Available To Provide Backup Power. Cold-start Capability Provides Temporary Battery Power When The Utility Power Is Out. Dataline Surge Protection Protects Connected Equipment From Power Surges On The Data Lines. Hot-swappable Batteries Ensure Clean, Uninterrupted Power To Your Protected Equipment While The Batteries Are Being Replaced. Wiring Fault Indicator Informs You Of Potentially Dangerous Wiring Problems In The Wall Circuit.