High quality, Double-conversion On-line UPS designed for essential power protection needs even in the most unstable power conditions Automatic internal bypass Supplies utility power to the connected loads in the event of a UPS power overload or fault. Automatic restart of loads after UPS shutdown Automatically starts up the connected equipment upon the return of utility power. ECO Mode Operating mode that by-passes unused electrical components in good power conditions to achieve high operating efficiency without sacrificing protection Input power factor correction Minimizes installation costs by enabling the use of smaller generators & cabling. Intelligent battery management Maximizes battery performance, life, & reliability through intelligent, precision charging. LCD display Alpha-Numeric Display which displays system parameters & alarms. Serial connectivity Use any Home Automation network to monitor & control the S20 through its RS-232 serial port. For information on how to communicate with the S20, see APC's Application Note 102. Crestron & AMX installers should visit their respective websites for information on how to integrate the S20 into those networks. USB (Universal Serial Bus) connectivity Provides management of the UPS via a USB (Universal Serial Bus) port (not available on all models).