Main Features 1) Line-interactive design and true sine wave output 2) Microprocessor control guarantees high reliability 3) Built-in Boost and Buck AVR to stabilize input voltage 4) Generator compatible 5) User-replaceable hot swappable battery design & cold startup capability 6) Data line surge protection, USB and RS-232 communication port 7) 19" Rack/Tower convertible 8) CE approval and FCC class B