The Lenovo Professional Wireless Rechargeable Keyboard (CH, Wireless) uses its own 2.4G unified dongle or Bluetooth for connection. It is not confirmed to be compatible with the USB adapter of the Lenovo keyboard type KBRFBU71 (wireless incl. mouse). Since the KBRFBU71 is supplied as a combo set with its own adapter, the keyboard and mouse usually only work with the original adapter of this set. It is usually not possible to replace the keyboard alone with another model and its adapter, as the dongles are often device-specific. There is no binding statement on the compatibility of the KBRFBU71 USB adapter with the Professional Wireless Rechargeable Keyboard. It is recommended to use the keyboard with the supplied dongle or to ask Lenovo Support directly for a confirmation of compatibility.

The keyboard has no special keys for ä, ö, ü. However, you can switch the keyboard to a German layout or enter umlauts via the operating system settings. Alternatively, you can also switch the Windows keyboard to the "United States - International" layout to type umlauts.

The key layout of the "Professional Wireless Rechargeable Keyboard (CH, wireless)" is QWERTZ, as it is specially configured for the Swiss market (CH), where the QWERTZ layout is standard.