... and double conversion design Effectively reduce the pollution of the AC network, provide pure power and good protection to mainly ... including temp, capacity, load, voltage and so on.When AC fails or low battery, the UPS can be started and ... external battery capacityNoise LevelDistance is 1 meter<55db(A)DisplayLEDAC, Inverter, Low battery, Bypass, Overload, FailureLCDLCD indicates voltage,frequency, ...