The OPTI-UPS Durable Series UPS line offers a set of essential features that make these devices a flexible power supply control and power saving tool. Its double-conversion design converts the incoming AC power into DC power, and then inverts it back to AC power. This ensures that the newly reproduced power is completely cleared of all imperfections coming from the AC mains. Regardless of what is going on the AC mains side, the UPS output voltage, frequency and signal purity are kept up to the highest standards. Zero transfer time insures that your equipment will stay up and running regardless of power fluctuations and outages. The battery is hot-swappable and replaceable, and optional extended battery packs are available. This compact, affordable unit is the ideal protection solution for personal computers, workstations and SME applications.