Biodots are made of heat sensitive material that changes color in response to changes in skin temperature. When you are stressed your capillaries constrict, reducing the flow of blood to the surface of the skin. That’s why your hands feel cold right before a job interview, or when you are about to get up and give a speech. The biodot simply acts as a thermometer, showing you the changes in temperature just beneath the surface of your skin. Biodots adhere to the back of your hand and change color as the flow of blood to your capillaries increases or decreases. Black means you’re stressed. Brown means you’re tense. Green means you are feeling calmer and blue means you are completely relaxed. https://www.stressstop.com/microsites/freebiodots.com/#requestForm