... function 1.True high frenquence On-line double conversion technology2.Rack mount type3.Wide input range4.Zero transfer time5.CPU ... versaZero LED indicators StatusLoad level / Battery level, Battery , Utility Power, Inverter, Bypass, Audible AlarmBypass, On battery mode, Battery low, Overload, Fault CommunicationsRS-232 ... C*KRS are longer time type High Frequency Online UPS Rack Mounted CR1KVA-10KVA