In Tokyo, the PASMO card lets residents pay for train fares quickly using a RFID-embedded card and reader. They simply wave the card as they enter or exit the station and it does all the work. But now PASMO is starting to do much more than that, handling transactions and acting as a credit card. And now it even helps parents keep track of their kids.
By installing PASMO locks at apartment buildings and check-ins at schools, parents can ensure that their kid has gotten to school safely and made it home after school by having text messages sent to them when their kid swipes the card. It's not quite as precise as a GPS-tracking phone, but it's enough to give Japanese parents some peace of mind.
Via Trends in Japan