5btn Micro Optical Wireless Rf Mouse Digital Radio Waves connect the mouse, eliminating the cord and improving the range of motion on the desktop Optical Sensing Technology scans the desktop at 1500 frames per second, providing the most accurate input device solution available in the industry today Step-n-Scroll Wheel Design allows you to scroll with pinpoint accuracy and control The rechargeable design allows you to recharge this mouse, eliminating the need to change the batteries every 2-3 months