The control buttons are also in English. The instructions are translated into German.

To set the 2-player mode on the ChessMan FX from Lexibook, follow these steps: 1. select mode: Select the "Multi Move" mode. This mode allows two players to play against each other while the computer monitors the legitimacy of the moves. 2. activate Multi Move: To enter Multi Move mode, select level 0. Press the button and then press one of the fields B8, D8, F8 or H8. Press the button again to activate the mode. 3. start the game: After the mode is activated, the two players can take turns making their moves. The computer checks the legitimacy of the moves without playing itself. These settings allow you to configure the ChessMan FX for a 2-player game in which the computer acts as arbiter.

Yes, they don't cause any problems. The children can also play chess with them!