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Philips is developing the technology as a contactless system to keep a virtual eye on hospital patients, such as newborn babies, who might find conventional monitors distressing.
ECONOMIST: Facial monitoring
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But the contactless payment system will not include daily price capping, which means if it is used several times in one day it will not stop charging once a passenger reaches the cost of daily travelcard.
BBC: London buses offer contactless card payment
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Being wrist-mounted, a watch is always close at hand, which makes it particularly convenient when operating contactless readers on public-transport systems (such as those used by London's Oyster system).
ECONOMIST: MONITOR