OmniSmart UPS Systems combine automatic voltage correction with long-lasting battery backup power to keep you working through brownouts and blackouts. Multi-level automatic voltage regulation keeps equipment working through low voltage (brownouts) and high voltage conditions without using battery power. Serial port and FreePowerAlert Software are included to provide automatic unattended shutdown. Reliable battery power keeps your equipment running safely through blackouts. RFI/EMI line noise filtering prevents interference (i.e. from motors, lights and radio transmissions) from affecting your computer. OmniSmart UPS Systems usually feature 6 outlets (3 UPS and surge protected, 3 surge-only protected) to safeguard your computer and all peripherals; line modem/fax protection to stop surges on two phone lines simultaneously; convenient battery replacement door. A 6-ft. telephone cord is also included.