The Adesso iMouse S8 - USB Retractable Mini Mouse is the perfect travel companion while on the road, and the perfect desktop mouse when you return, Our 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. Its built-in DPI of 800/1200/1600 and optical sensor lets you navigate your cursor with better speed, accuracy, and reliability on almost all surfaces. Retractable USB Cable The USB cable is retractable making the tangling of wires a thing of the past. Pull cable at desired length with a maximum pull of 2.5ft. Adjustable 3 Level DPI Switch (800 / 1200 / 1600) The 3 Level DPI switch allows for different cursor sensitivities for your personal needs while providing accuracy and precision to maximize your tracking performance. Multi-color LED Backlight Multi-colored LEDs illuminate the edges of the mouse which gives the mouse a unique look and better accessibility in low-light environments. Enhanced Optical Sensor Optical sensor technology precisely and accurately tracks cursor movement and lets you work on most wood, marble and leather surfaces without the need of a mousepad.