Enjoy wireless connectivity at your fingertips. The Microsoft Wireless Optical Notebook Mouse 4000 gives you all the function you need in a mouse, without any annoying cords to get in the way of your productivity. It features four buttons and a scrolling wheel, with optical movement detection at 1000 dpi. That means you get precise, accurate tracking for all your program and application needs. The mouse fits comfortably in your hand, so you don't have to worry about cramping or pain even during long work, gaming, or creative sessions. It's perfectly portable, capable of going anywhere with you and your notebook. It stores easily and works flawlessly each time you plug in the wireless receiver. It's compatible with both PCs and Macs, so you're free to work, play, and travel no matter which platform you use.