The eSense Temperature is a small sensor for measuring your skin temperature with the microphone input of your smartphone or tablet (Android or Apple iOS.) Handwarming training is an especially effective and common biofeedback method. The temperature of our hands is connected to our stress level: When we are stressed, we tend to have cold hands. Immediate feedback enables you to voluntarily increase the skin temperature in your fingers, thus increasing your peripheral blood circulation, leading to relaxation and stress reduction. The eSense provides you in various ways with exact feedback about your momentary stress level, e.g. with measurement curves, video display and audio feedback features. For the audio features, the eSense has a headphone jack now. This means that additional to the auditory feedback you can listen to music or audio books while training your stress level down! The app for eSense is free, and allows exporting the measured data via e-mail. We also recommend using the eSense Temperature with the Innovative Finger Clip (in the Mindfield Shop). This enables a comfortable fixation of the temperature sensor to your finger.