How loud

I've never used this one personally, but I can tell you from experience with similar ones that Wild Orchid is right, free moving plastic beads can be very noisy. In the Doc Johnson iVibe Rabbit for example, you would definitely be able to hear it from across the room, maybe even through the door depending on how thin it is and how much other background noise there is. I would recommend that if you want it, go for it. But only if your living situation allows for you to turn on a TV, radio, etc in the event that it is pretty noisy. A test you can do if you're home alone is to turn it on, rotation and all, place it under your covers, then step outside your bedroom and see if you can hear it. If so, do the same test with the TV or something on. Sorry I didn't have a firsthand opinion about this toy in particular, but I hope I was still helpful!