You can buy them as keychains: https://www.youtube.com/watch?v=27vg9vmMNdg …
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Oh snap you can get a status checker--tells you Yamanote Line departures from your nearest station
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Forgot the link smh: https://www.youtube.com/watch?v=vPWD0gplmyo …
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That's really, really cool!
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How well did these survive alongside smartphones?
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they're a novelty item, not widely used at all--just for fun
End of conversation
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