Just for fun, I tried buying this because my friend recommended it for transportation in Japan, taking the Skyline train directly from the airport. It turned out to be quite helpful, the exchange was smooth, the train staff were also quick to help with information, plus it's quite good if you use the train a lot in Tokyo, you can save 3 days without having to bother topping up. The Tokyo city train ticket is valid from the day we tap it on the machine, so it's flexible when you want to use it or keep it until you go home. Recommended 👍