Microsoft Wireless Desktop 850 Combo

Features:
Enjoy the 2.4-gigahertz (GHz) wireless technology, which delivers a reliable connection with up to a 15 foot range, with virtually no interference.
This keyboard features Advanced Encryption Standard (AES') technology, which is designed to help protect your information by encrypting your keystrokes.
Each keyboard is permanently paired with its receiver at the factory - no key information is ever shared over the air.
Quickly access frequently used tools, like the calculator, zoom and audio controls by using shortcut keys.
Superior comfort that's designed to fit your right or left hand.
Precise optical tracking technology provides highly responsive cursor control.
Plug the wireless receiver into your computer's USB port when you're 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 battery is running low.
Move through documents and webpages quickly.
Turn off your mouse to extend battery life.
Simply press the Windows start screen key to view your apps and start screen.
Experience fewer interruptions with up to 15 months of battery lif for your keyboard.

Specifications:
Operating System:
Requires a PC that meets the requirements for and has installed one of these operating system:
Windows 10 / 8 / 7
Mac OS X v10.4 - 10.7
Hard Drive: Customizable Windows features require Mouse and Keyboard Center software (150 MB software download) and the latest Windows update.
Other:
USB port
2 AAA and 1 AA alkaline batteries (included)