Second interview, so down to a short list. It's all about them looking for the best match to their company's style and methods.

The first interview and your research should have given you some ideas about the company's aims and what they were looking for so you should use the time before the second interview to think of things you have done, successes you have had, in your life that will benefit them. Not just perceived strengths, which can be subjective, but actual achievements that show those strengths.

You've got skills and experience; demonstrate reliability, enthusiasm and some ideas of your own.

Good luck.