The clicking noises of the mouse are not very loud, but not quiet either. Definitely not something if someone wants to sleep in peace in the same room. (But a gaming PC is probably also a nuisance ^^)

The sounds (clicks) are not loud, but one mouse can be different from another, even if it is the same model. For example, I have returned two identical mice from other dealers because the mouse wheel was so loose that you could feel it when you moved the mouse left and right while playing. Some mice have too much space for the wheel. I used to have the Razer Naga Molten for about 10 years. Now I've switched to the latest Naga and am generally very satisfied. I can recommend the mouse.

So loud that you would have to put something over it so that it doesn't disturb anyone.