Hong Kong has made it mandatory for all new arrivals to wear an “electronic wristband” that links to a smartphone to provide location-tracking services, so that authorities can be sure they’re observing COVID-19 quarantine requirements.
https://go.theregister.co.uk/feed/www.theregister.co.uk/2020/03/19/hong_kong_makes_wearable_trackers_mandatory_to_enforce_covid_19_quarantine/
https://go.theregister.co.uk/feed/www.theregister.co.uk/2020/03/19/hong_kong_makes_wearable_trackers_mandatory_to_enforce_covid_19_quarantine/