Elea is an activity monitor that indicates the period of each woman's cycle with great precision. The measurement is carried out at night, in the calm. During the day the sensor attaches very easily to the wrist to be worn in all discretion. A simple press on the sensor displays the cycle period thanks to an simple color code. Elea can be used to better understand one's cycle, optimize one's chances of making a child or for a contraceptive purpose within an informed and experienced couple.