APC Back-UPS Cs BK500BLK 500VA/300W UPS System 6 outlets-3 ups/surge, 3 surge only 1, 020 Joules and output frequency (sync to mains) is 50/60Hz +/- 3 Hz 2 Block-spaced outlets RJ11 modem/fax/DSL protection (2 wire single line) Audible alarm Product Type - Back-UPS Connectivity - USB Output connections - (3) NEMA 5-15R (battery backup) Product Type - Back-UPS Connectivity - USB Connectivity - USB Output Connections - (3) NEMA 5-15R (Battery Backup)