In external studies of mechanism may be a feasible approach to explore biological effects of RF radiation in the case of no persuadable conclusion of epidemiological and in external studies.
But whether it's Bluetooth, RF or infrared, the experience of these wearable pieces of technology are only getting more detailed to make every fan feel like part of the show.
When fans went to their seats at Madison Square Garden, they found one of these RF wristbands waiting for them, each one pre-programmed to be a part of a different group.