Mumbai: A tiny, $900 wearable device being developed by an Indian billionaire entrepreneur and showcased by some of the country's top sportspersons has sparked criticism from doctors who say its claims of tracking blood flow to the brain are exaggerated.
The Temple device is less than 1 inch (2.54 cm) wide and weighs under 2 grams (0.07 oz). It sticks to the side of the head between the forehead and the ear, or the temple area.
