Another of the '#TechnologiesofHope: 100 Responses to the #Pandemic' is from the German company #Kinexon. Their wearable wristbands proactively warn users if they do not maintain a 2-metre distance and record instances of contact and 'contact intensity': https://techpandemic.theglassroom.org/#safezone
100 Pandemic Technologies

This research project presents a selection from the hundreds of data-driven technologies used around the world to combat the pandemic. The curation of examples presented in Technologies of Hope have been chosen to represent the breadth of sectors, products and ideas that seek to offer solutions for a wide range of pandemic related problems.