This
watch-sized ring can be worn on the wrist side and tracks your emotional status by measuring
several physiological data such as heart rate, body temperature and skin
moisture levels.  This device sends the
physiological data to a server via Bluetooth to analyze the data. If the data
meet certain criteria corresponding to angry, angry, etc. the device notifies
the user with a message. For full study please visit the URL below.

http://io9.com/368236/emotion+tracking-wearable-device-lets-your-boss-monitor-your-feelings