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BBC News By Suzanne Bearne image copyrightMoodbeam image captionThe user of the wristband presses the yellow button if they are happy, and the blue if they are not At first glance the silicone wristband could be mistaken for one that tracks your heart rate when you are doing exercise. However, the wearable technology, called a Moodbeam, isn t here to monitor your physical health. Instead it allows your employer to track your emotional state. The gadget, which links to a mobile phone app and web interface, has two buttons, one yellow and one blue. The idea is that you press the yellow one if you are feeling happy, and the blue one if you are sad. ....