The keys on this black model are not illuminated. The keyboard has membrane technology and does not offer backlighting of the keys.

Please contact our Galaxus Assistant in this regard so that we can help you individually with your request: https://www.galaxus.de/help

The Logitech Signature K650 keyboard does not have built-in or rechargeable batteries via a cable. Instead, it is powered by two AA batteries, which are included with the purchase. These batteries can last up to 36 months with average use, so you do not need to purchase additional batteries immediately.

Have you already pressed the Num Lock button at the top left of the numeric keypad? If not, you are welcome to contact our customer service so that they can check this in more detail and help you. You can find our contact form under the following link: https://helpcenter.galaxus.ch/hc/de/requests/new

According to the supplier, the keyboard is compatible with Apple MacOS 10.15 or later.

For the F keys, you must first press FN at the bottom next to the space bar. Or do you mean the additional function?

It is the setting of the keyboard. Here is the link that explains how it works: https://support.logi.com/hc/de-ch/articles/5124495316631-Getting-Started-SIGNATURE-K650#boltpair

This is QWERTY.