Multiple companies are offering wearable contact tracing devices, including Accent Advanced Systems, Kerlink, Microshare Inc., and TRACEsafe Technologies Inc., and they have already been used in Bahrain and Hong Kong to monitor individuals in quarantine.They are also cheap, with the typical components required including a Bluetooth chip, memory for storing recent contact information, and a battery for power. The cost is thought to be less than $10 per device.
Read more at: https://www.pcmag.com/news/singapore-is-giving-all-57m-residents-a-wearable-covid-19-tracker
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