In Migros, prices are no longer displayed on signs, but all prices are switched directly from the system to these small Bluetooth signs. It would be interesting to record the radiation exposure in the store before and after the introduction. It is simply increasingly difficult for customers to track price changes, which is of course a disadvantage. Whether the new solution is more ecological than the paper labels, apart from the radiation exposure, depends heavily on the battery life of the "price tags" and the history and production of the electronic price tags.