t Customize UPS capabilities with management cards. LED status indicators Quickly understand unit and power status with visual indicators. Serial connectivity Provides management of the UPS via a serial port. Plug-and-Play external batteries Ensures clean, uninterrupted power to the loads when adding extra runtime to the UPS. Rack/Tower convertible Protects the initial investment in the UPS when migrating from tower to rack-mount environment. Flash upgradeable firmware Install maintenance releases of firmware remotely using FTP. User-replaceable batteries Increases availability by allowing a trained user to perform upgrades and replacements of the batteries reducing Mean Time to Repair (MTTR) Automatic self-test Periodic battery self-test ensures early detection of a battery that needs to be replaced. Predicitive failure notification Provides early-warning fault analysis ensuring proactive component replacement. Disconnected battery notification Warns when a battery is not available to provide backup power. Audible alarms Provides notification of changing utility power and UPS power conditions Frequency and voltage regulation Gives higher application availability by correcting poor frequency and voltage conditions without using the battery. Power conditioning Protects connected loads from surges, spikes, lightning, and other power disturbances. Input power factor correction Minimizes installation costs by enabling the use of smaller generators and cabling. Generator compatible Ensures clean, uninterrupted power to protected equipment when generator power is used. Cold-start capable Provides temporary battery power when the utility power is out. Resettable circuit breaker Easy recovery from overloads; no need to replace a fuse. Safety-agency approved Ensures the product has been tested and approved to work safely with the connected service provider equipment and within the specified environment.