The radio producer wants you simply to be an interesting guest for his or her audience, and that usually means providing the audience with useful information. If you offer useful information along with a little information about your product, that's acceptable. If you sound like a commercial for your product, that is not acceptable. Speak one to three sentences at a time. If they want more explanation, they will usually encourage you.
Some interviewers do all the talking.
The good ones let you talk. They are very distracting. It may be a bit disconcerting because you can usually hear yourself being interviewed in bits and pieces. After the interview, write a thank you note to the producer and the hosts. Tell them that whenever they'd like to have you back, you'd love to be a guest.