1. 19 inch rack mounted design. 2. Online double conversion technology. 3. IGBT PFC ... percentage, battery state, utility state, inverter and bypass state, overload, system fault.Audible alarmBypass mode, battery mode, battery low, overload, faultCommunicationsDB9 ... *H(mm)482*450*88(2U)482*600*130(3U) Rack Mount UPS 1-6KVA