A necklace encouraging you to keep a social distance.
Meet 'Bump' - the wearable device that helped this year's London Marathon take place, despite restrictions due to COVID-19.
Andrew Nicholson is the Group Marketing Manager at Tharsus, Bump's developer.
''It makes two signals, blue when you are two metres away from another Bump wearer and red and a loud beep when you're one metre away."
The device was worn by the 100 elite athletes and 500 race staff to help maintain the bio-secure bubble ahead of the marathon on October 4, alerting the wearer when they came within 2 metres of another device.
Bump also allowed race organisers to log how often and for how long elite athletes and event staff spend within a pre-defined distance of each other and will be used to track and trace should someone test positive within two weeks of the race.
The London Marathon's director Hugh Brasher believes the technology can go beyond marathons.
"I think that this technology can be used in business, really importantly, if your company is trying to come back to the office, so many conversations going on about how do you ensure someone's safety? Health and safety so important these days. Not only offices but warehousing. And absolutely, could it be used in marathons in the future? Yes, but I think it's much wider, about how it can be used to get us back to some form of normality."