Questions about Microsoft ARC Touch Bluetooth mouse

The T450s comes with Windows 8.1 and Bluetooth 4, so, YES. This works.

Thank you for the information. However, please contact the customer service directly so that you can 1. exchange the product and 2. report the error. We in the community can't help you much either.

Obvious configuration error on the part of Digitec. It is best to report it to digitec@digitec.ch :)

It's a mouse, not a keyboard. Yes, suitable for windows 10, even an app specially created for it is available. Note the Bluetooth version.