Double card! 85euro for what? What is the insurance coverage?

Hello! I picked up my new car about a week ago. How I heard about my insurance and got me a double card. So I went to the registration office and got the 5 day registrations. Now I didn’t get my car with my old insurance anymore. So I went to the new insurance and I got a certificate from there to get the right registrations. So when I was going to the old insurance company today I thought about it. the cost now 85 euro. Yes, something like that. For 5 days 85 euro? And that with a lumboiegen liability insurance! Now my question. I was not told that this costs 85 euro. I also signed nothing or something. Is that right now with the 85 euro? How high is the insurance protection exactly? Mfg Patric