The USB Retractable Mini Mouse is the perfect travel companion while on the road, and the perfect desktop mouse when you return. This innovative design features a built in scroll wheel to enable you to scroll up or down with pinpoint accuracy and control. A Retractable USB Cable allows you to expand and collapse the cable for improved mobility. Scalable DPI of 800 or 1,200 allows you to adjust the accuracy of the sensor for larger screens when using for desktop and scale down when using for laptops or tablets. The Optical sensor allows you navigate your cursor with better speed, accuracy and reliability on almost all surfaces. The USB Cable is retractable and does not tangle, making messy cables a thing of the past in your laptop bag. Maximum pull length is 2.5 feet.