So. I just got my Mona 2 a few days ago. It's only my third vibrator and the most powerful one yet, but I just wanted to make sure that it's supposed to sound like this. When it's on the lower settings, you can hear a very discernible rattling noise, as though there were a ball in the centre just banging around. When it's at the highest power, it can't be heard. My other vibes don't have this rattling noise, so I just wanted to see if this was normal or not.