Questions about AirTurn Duo 200

In professional circles, the product AirTurn duo is praised. There are two versions of it. The -200 is somewhat older and the -500 is current and the improved version of the -200. They only offer the -200 version and that at a much higher price than a competitor (albeit from Germany). On the other hand, the -500 is apparently only available in Switzerland at an even more impressive price from a supplier I don't know. That, on the other hand, is outside the bounds of reason. I would be pleased to receive a hint. Kind regards Werner Brülisauer The 'cheaper' version: https://www.thomannmusic.ch/airturn_duo_500.htm?glp=1&gclid=Cj0KCQjwjvaYBhDlARIsAO8PkE00s-C8M2RDVCEIOWbREBduL7Cp-MIT6CFbNEg_CLy0Q8HSOPe5KucaAkADEALw_wcB The more expensive variant: https://techstudio.ch/products/airturn-duo500-bluetooth-fussschalter-controller