I'm looking for something for the Ms. Two things I want to look into and get for her are Ben Wah Balls (Sorry for the spelling if it's wrong) and this thing I've seen where it can just be slipped on your finger and vibrates. It's for the clit mostly I believe. My questions are:

A.) How do Ben Wah Balls work and what do they do? I heard they vibrate but how. As my understanding there are no batteries or anything involved.

B.) She's not ANTI using toys but has said no so far but is slowly softening on the position (Sorry for the pun) so I would like to get her something. How can I BEST approach it. I've told her I would love to watch her do that and even participate somehow.