This Microsoft Comfort Optical Mouse 3000 is a great addition to your computer setup. With its ergonomic design and adjustable DPI, this mouse is perfect for those who want a comfortable and precise cursor control. The mouse features programmable buttons, a thumb button, and a scroll wheel for easy navigation. In addition, the mouse has LED lighting and side to side scrolling capabilities, making it a versatile tool for any computer user. It is compatible with PS/2, wired, and USB connectivity, and has a maximum DPI of 1000. This Microsoft Comfort Optical Mouse 3000 is made in China and has four buttons.