Medallion is like a key, that’s all. I’ve kept a few, wanted to “play” with them. I believe they are passive rfid’s, meaning they contain no battery but energize when they are near a device. I also believe Singapore is where they are made. My only complaint is last two cruises they did not arrive in time and had to obtain another one at port. This in turn required us to go to help desk to get “re-read” due to certain issues.