Sometimes there is need of devices which should intimate us when power goes off, so that we could switch off our devices if they are battery [[wysiwyg_imageupload::]]operated or they are getting power from some other limited source [such as for computer using UPS(uninterrupted power supply)]. This project can solve our purpose and can intimate us if power supply fails. This circuit has a 555 timer at its heart and following components that aid its working:1N4148 Diodes Resistors in the range of Kilo and Mega Ohms. Capacitors at the range of Micro Farads and Nano Farads.A 9volt battery taking care of the power supply of the circuit.