From Amazon
PowerWalker VI 500 R1U UPS 500VA/300W Line Interactiv, 10121047 (UPS 500VA/300W Line Interactiv Silent, 1U slim, HID driver, Pure Sine Wave)
Compadvance
PowerWalker Vi 500 R1U
Athema Services
powerwalker vi 500 r1u ups 500va/300w line interactiv 10121047 - eet01