Most optical mouses that do not have a switch or button to select the Dpi mode of them on the mouse work at about.
1200 Dpi, if you can switch between optical Dpi modes via a switch on the mouse the range can vary from
800 dpi, 1200 dpi, 1600 dpi and 3200 dpi.
For pure gaming mouses the dpi range can be as high as 9600 dpi and above.
No doubt the acer mouse if a basic mouse will be 1200 dpi max.