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SmarTrip was the first contactless smart card for transit in the United States [23] when WMATA began selling SmarTrip cards on May 18, 1999. [24] By 2004, 650,000 SmarTrip cards were in circulation. [25]
A Blue Light Station is a combined emergency telephone and emergency power-off switch in rapid transit stations and other points along electrified railways. They are common in the United States and Canada. [citation needed] The location of such a device is usually indicated by a blue light.
Blue light phototherapy, light therapy involving a medical device that radiates blue light; Cobalt blue light, a type of light used by slit lamps to help in the diagnosis of eye diseases; Effects of blue light technology; Blue Lanterns (disambiguation) Bluelight (disambiguation)
Blue light is absorbed by the structural proteins, enzymes, and protein metabolites found in the lens. [9] The absorption of blue light creates yellow pigments in the lens's protein. The lens progressively darkens and turns yellow. [9] Blue light is absorbed by the lens, preventing blue light from reaching the retina at the back of the eye. [12]
A contactless smart card is a card in which the chip communicates with the card reader through an induction technology similar to that of an RFID (at data rates of 106 to 848 kbit/s). These cards require only close proximity to an antenna to complete a transaction.
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These are: Adult (black), Child/Youth (green), Senior/Pensioner (gold), Concession (silver), Employee (blue) and School (light blue). [37] [38] [39] Reusable Opal cards can be ordered online or over the phone. Adult and Child/Youth cards are also available from retail outlets, such as convenience stores, newsagents, supermarkets and at Service ...
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