This circuit causes an LED to flash at intervals determined by C1 and R2 and for a duration given by R3. These components can be changed. The brightness of the LED is given by R1 which can typically have values between 470-ohm and 1k. As consumption is very low, as it only occurs with LED flashes, the power source will have great durability. This project is from the book Fun Projects for The Experimenter by Newton C. Braga, published in the United States.
