Recently I have bought intex safeguard 1 kv ups which is sine wave type.its operating temperature range is 0 to 45 degrees celsius.it properly operates between RH value ranging from ( to 90% non condensing.this 1 kv ups input voltage is 141 v ac to 280 v ac and storage capacity is 1000 va.this ups costs me 3800 rupees which is affordable.this ups is working prperly.i attached it to my desktop computer unit and it provides no fluctuation and smooth power supply.i am happy to buy it.