
The FOB, meant to be a GPS tracking device in the form of a wrist band, has to be worn by every individual in the IPL ecosystem at all times. It works on Bluetooth and a receiver – a mobile app called ‘bio-bubble’ – obtains data from the device to track the movement of any individual wearing it.
source
https://timesofindia.indiatimes.com/sports/cricket/ipl/top-stories/ipl-gps-device-to-track-movement-of-individuals-in-bio-bubble-found-to-be-faulty/articleshow/82382538.cms
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