"My Flow" is an invention of a startup founded by students of the University of Berkeley, in the United States. This is a connected tampon that alerts her user of her filling rate via a smartphone application. The My Flow pad has a wire fifty centimeters containing an integrated sensor. Thereof is connected to a small device that is fixed to the belt. This device, which looks like a key-chain, sends information about the user's smartphone via Bluetooth. An application can track in real time the fill rate of the tampon and informs when it should be changed. Still in prototype stage, the complete kit should cost 50 dollars, and the box of tampons, sold about 10 dollars.