• Daily Mail, Monday, January 16, 2017 9:03 AM

Employers across Britain and North America are fitting their staff with wearable tracker devices to monitor their fitness, productivity and stress levels 24 hours a day. At least four companies - including a major bank and part of the NHS - are using 'sociometric badges' to measure the conditions of their staff. The credit card-sized devices created by Humanyze include a microphone that analyses the tone, speed and volume, but not the content, of a person's voice, scan for proximity to others and measure physical activity and sleep patterns.