Many of us have habit of not to save the data or work while working on system and lost our valuable work and time while working, as UPS shuts off automatically because of low batter. There are some software available in market which will give you indication that your system is going to shut down but they are very costly and some free ware are also available but they may contain threat of viruses that may damage your PC. So we have describe a simple circuit which will automatically hibernate your PC before UPS battery goes off. And important feature of this circuit is it will not require any software to be installed on your PC.