While the instructions are only in English, but after a short time you will find self-explanatory switching to German Sprachem and reading works prima error by descriptive text, and just as easily removed again.
Therefore, I would recommend this unit at least for Opel Astra G, H and Zafira B without hesitation.
For a moderate price, the investment by 3 x reading has paid off (instead workshop to go and every time "x" to pay an amount)