Great! It has a unique QR code, so I don't have to ask people one by one. Also, the backend can track the rates at which letters are being lost in different locations, which will be useful when negotiating with the postal service. This is really cool! I can use my "Meow Machine" to print the QR codes, so I don't need a printer. It's also a convenient way to do it. I'm going to start using this over the weekend.