Bigbruin.com has posted a review on the Sunbeamtech X-1300 Sensor-X Gaming Mouse

The only unusual item on the bottom of the Sensor-X is a switch that allows you to switch this mouse from 650dpi to 1300dpi. The difference in dpi means you don't have to choose a mouse based on the speed or precision you require for certain applications. You can now have one mouse and easily switch modes depending on your individual needs.

Sunbeamtech X-1300 Sensor-X Gaming Mouse Review