CyberPower OLS1500ERT2UA is a high-performance UPS featuring online double-conversion topology, which provides seamless Pure Sine Wave power for mission-critical devices such as NAS and servers, DVRs/surveillance systems, transportation and infrastructure, and emergency systems. It's typically integrated in the back office, server room, and data center environment. The UPS features a color LCD panel for users to monitor power system and configure settings easily, and relay-type dry contact to perform local management. This model is designed with extended battery module auto-detection, which can automatically detect the quantity of connected Extended Battery Modules (EBM) to estimate UPS's runtime. The variable speed fans provide automatic thermal management based on power load to reduce noise and provide greater comfort for users.