Kyocera Corporation announced that it has developed one of the smallest known optical blood-flow sensors, which measures the volume of blood flow in subcutaneous tissue. The device functions similarly to green LED lights used for measuring heart rates, except it uses laser technology. With the sensor, Kyocera is researching a variety of mobile health (mHealth) applications such as monitoring stress levels or preventing dehydration, heatstroke and altitude sickness by studying trends or changes in blood-flow volume as alerts for these conditions and developing algorithms for detection.