The electronic Rakat counter is a pocket sized device that automatically detects and counts the number of Sujoods and Rakats of a person performing Salat.
The yellow LED indicates that one Sajda has been performed and the next Sajda is expected. On detection of the second Sajda the yellow LED turns off and a green LED turns on to indicate that one unit of prayer has been completed. A person performing Salat can track the count of Rakats by checking the number of green LEDs that are turned on.