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The Wireless Desktop 900 Keyboard and Mouse from Microsoft features a quiet-touch keyboard and a full-sized ambidextrous mouse. The keyboard features easy-access hotkeys for commonly used Windows functions, and AES (Advanced Encryption Standard) technology helps protect your information by encrypting your keystrokes. Additional Windows features can be accessed by the mouse via its customizable buttons. In order to access the customization feature, you will need to download Microsoft Mouse and Keyboard Center software, as well as the latest Windows updates. The keyboard uses two AAA batteries, whereas the mouse uses two AA batteries. Both the keyboard and mouse have an average battery life of 2 years, depending on use.