Neffa is brand dedicated to "translating technology into surprising, tangible results," so it's no wonder, then, that they've applied emotion detection technology to wearable items.
Slightly more sophisticated than the mood rings of the 90s, the Chameleon Mood Scarf by Neffa not only detects your disposition, but actively helps improve it. The name is derived from the fact that, just like the lizard species, the Chameleon scarf switches its color and pattern according to temperature, UV light and, of course, mood.
When your body temperature is regulated the scarf's color and prints are bright. However, if your body temperature rises, indicating anger or stress, the bright print disappears (this is due to the fact that the pattern is printed in thermochomatic ink that is responsive to heat). Ultimately, the scarf is intended to "create a permanent sense of comfort, warmth, peace, and safety," in consumer's day-to-day lives.