Main Features: 1) Compact 1U or 2U design (1U for 500 ~800VA, 2U for 600~1000VA) 2) Provides line-interactive design and true sinewave output 3) Microprocessor control guarantees high reliability 4) Built-in Boost and Buck AVR to stabilize input voltage 5) User-Replaceable hot swappable battery design & cold startup capability 6) Enable to extend runtime with scalable external battery pack (inbuilt 10A battery charger) 7) Fully protection for overload, short-circuit, overheat and battery over discharge protection 8) RS232 /USB communication port 9) SNMP Card SLOT available