A button that tells your boss you're unhappy: Why mental health wearables could be bad news at work

With gyms closed and millions cooped up and restless at home, it’s little wonder that “healthtech” is now being billed as the next big battleground over which the likes of Microsoft, Apple and Google will fight. Chief among their products are wearable devices that measure your heart rate, your step count, and dozens of other data points that keep you informed about your physical health.