Typically, this will be the highest DPI on offer rather than the range the mouse supports, but some manufacturers including Logitech specify the range. Unless it’s an unbranded mouse, there’s a chance you’ll find a spec sheet which lists the DPI figure. The most obvious thing you can do is search online for your make and model. It can be tricky to find out with some mice, but here are a few ways you can determine the DPI of your mouse. Many gaming mice have buttons that let you switch DPI on the fly while you’re playing, too, but what if you don’t know your mouse’s DPI? Or you don’t know the DPI settings it switches between? There are even online calculators that can translate your settings from one game to another. Games often let you use a higher DPI with a lower sensitivity so you move the mouse the same distance: this is useful if you're changing mouse or playing a different game and don't want to have to relearn that muscle memory for turning 360°, for example.
This is a problem if you're a gamer, though this article isn't going to get into the debate of whether a lower or higher DPI setting is best. DPI stands for dots per inch, so a mouse with a higher DPI will move the cursor on screen further than a lower-DPI mouse when both are moved the same distance.
The DPI of a mouse determines its sensitivity.