Microsoft 850 Desktop Keyboard Mouse

2.4 (GHz) wireless technology. Superior comfort that is designed to fit your right or left hand. Precise optical tracking technology provides highly responsive cursor control. Plug the wireless receiver into your computer USB port when you are ready to work. Then snap it into the bottom of your mouse when you travel, and the mouse will automatically turn off. Avoid getting caught with a dead battery. The battery status indicator glows red when the battery is running low.