CyberPower UR500RM1U Standby UPS - 500VA/275W 4-Outlet RJ11/RJ45 1U-Rackmount 500VA / 275Watts Full-time lightning protection &amp; Battery Backup 1U Rackmount, 4 Outlets Telephone-line/Network/Broadband (RJ11/45) protection, Serial port, EMI/RFI filters Applications: PCs/Workstations, Retail/POS, Audio/Video, Security