This is a single speed vibrator; it doesn't have any interesting patterns or functions. The vibrations are of a moderate strength, and will be enough for a majority of users; if you wanted to diffuse the vibrations or use Lina as a warmup toy putting the sleeve on it will work well to do so. The vibrations are focused in the top of the toy, but they can be felt all the way down the toy. Unfortunately, I've found that with increased pressure on the tip of the toy, the vibrations dampen.
I didn't find the toy to be noisy, and the quiet discretion boded well for its undercover aesthetic.
More obnoxiously than anything else, though, when you turn the toy too far left (such as when you overshoot turning the toy off) the entire top of the toy pops off and the batteries fall off. This happened to me rather frequently when I was trying to remove the nubby sleeve unsuccessfully--it was much easier simply to peel the sleeve up rather than to slide the sleeve off.