INTERNET525SER standby UPS offers protection from blackouts; brownouts and surges on both AC and dialup modem lines; Provides seamless battery derived AC output during blackouts and severe brownouts so that connected equipment can be shut down without data loss; Built-in DB9 contact closure interface port enables automatic system shutdown if power fails while the system runs unattended;3 battery supported outlets protect computer; monitor and one vital system peripheral; plus 3 additional surge suppression-only outlets for printers and other system accessories not requiring battery support; Attractive stealth black UPS color scheme; Built-in single line phone jacks with line splitter protects peripherals with a standard dialup phone line connection; phone cable included; Built-in audible alarm and front panel LEDs offer continuous status information regarding line and battery power operation; 525VA /300 watt power handling ability supports entry-level PC systems for several minutes during power fail conditions; Includes attached 6 ft. AC power cord; on/off power switch; Compatible with 120V / 60 Hz applications in USA; Canada; Mexico and other countries; 2 year warranty (worldwide); plus $100;000 connected equipment insurance (USA & Canada only).