The BBC had a piece last night on the use of social distancing beacons at Florence Cathedral in Italy.
The beacons are worn by visitors and vibrate and flash when people get too close to one another. The reporter, Mark Lowen, said that it was the first use of the devices which might be true of that device model but not of social distancing devices in general.
Read about Beacons for Workplace Social Distancing and Contact Tracing