Smart-UPS RT is a family of high performance UPSs for servers, networking equipment, telecommunication systems, industrial & medical equipment, and other mission-critical applications. Smart-UPS RT UPSs are based on the field-proven, industry-leading Smart-UPS functionality, but feature double conversion on-line topology, which delivers tight voltage & frequency regulation, zero transfer time to & from battery, and input power factor correction. While offering advanced performance & high availability features, the Smart-UPS RT can be managed using Power Chute software, as well as an array of Smart Slot accessories. Smart-UPS RT provides battery back up to the load through the use of internal batteries. However, an unlimited number of external battery packs can be added to meet desired levels of runtime.