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Tripp Lite's INTERNET350SER Ultra-compact standby UPS with built-in DB9 serial monitoring port protects PCs, network workstations, and other systems reliant upon a basic communications interface for UPS monitoring and unattended system shutdown. Maintains AC output during blackouts and brownouts starting at 99V. Includes DB9 monitoring port with cabling, TEL/DSL line surge suppression, surge only outlets and LED indicators. PowerAlert software available free via download.