Digital Smart UPS Systems" reliable battery backup keeps PC systems operational for up to 75 minutes during blackouts. Automatic voltage regulation (AVR) corrects brownouts back to safe 120V power without draining the UPS battery. Surge suppression and EMI/RFI line noise filtering prevent hardware damage and poor audio and video performance. A large, rotatable, illuminated LCD screen with dimmer switch shows incoming power conditions and UPS operations in real time. Dataline surge protection. USB ports work with FREE unattended shutdown software, so your files are saved in the case of a blackout, even when you"re not there. System VA: 1500 VA; Backup Time at Half Load: 13 minutes @ 450 Watts.