The compact keyboard-and-mouse combo with all the standard keys, extended battery life and reliable, long-range wireless. The compact keyboard is about 36% smaller than standard keyboards but still has all the standard keys. A 24-month keyboard and 5-month battery life mean you can go for months without the hassle of changing batteries. Set up couldn t be easier - you simply plug the wireless receiver into a USB port on your computer and start tweeting, blogging and IMing right away without software. 2x AA and 2x AAA batteries required (included). Keyboard: Black Plug and play Cordless USB connectivity Mouse: Optical sensor 2 buttons Scroll wheel General information: Batteries required 2 x AAA (included) Manufacturer s 2 year guarantee