KSTAR 850VA Offline UPSSpecification Main Feature Capacity 850VA Input Voltage 140 290VAC Output Voltage 140 290VAC Noise Level Less Than 40dB Input Features Frequency 50Hz 1Hz Voltage Range 140 290VAC Output Features Backup Time Up To 30 Minutes Voltage Range 140 290VAC Warranty Information Warranty 1 Year Warranty Under the following conditions, the warranty would not be provided: UPS burning due to thunder, abnormal overload, insect entrance and others. If ambient