From the manufacturer

Wireless freedom
Enjoy the freedom and convenience of wireless technology. Confidently roam up to 15 feet away from your PC while maintaining a strong wireless connection. Setting up the keyboard and mouse is simple—just insert the batteries, plug in the tiny transceiver, and start typing.
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Snap-in transceiverPlug 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. |
Includes the Wireless Mouse 1000The Wireless Mouse 1000 is designed for comfort in either hand and uses Microsoft optical technology to provide precise optical tracking and highly responsive cursor control. Take the mouse separately to use with a laptop while traveling—the tiny transceiver conveniently snaps into the bottom of the mouse when it’s time to pack up and go. |
SecurityThis 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. |

Keyboard version | Microsoft Wireless Keyboard 850 |
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Mouse version | Microsoft Wireless Mouse 1000 |
Transceiver version | Microsoft 2.4 GHz Transceiver v8.0 |
Operating systems | Microsoft Windows 10 / 8 / 7, Mac OS X v10.4.x – 10.10 |
Customizable features available for Windows | Requires Mouse and Keyboard Center software installed on a PC that meets the requirements and has one of these operating systems: Microsoft Windows 10 / 8 / 7, 150 MB of available hard disk space |
Wireless range | 15 feet (5 meters) typical. Note: RF range is affected by many factors, such as nearby metallic objects and relative positioning of the mouse and receiver |
Wireless frequency | 2.4 GHz frequency range |
Battery type and quantity | Keyboard: 2 AAA alkaline batteries (included), Mouse: 2 AA alkaline batteries (included) |
Battery life | Keyboard: up to 15 months, Mouse: up to 8 months |
Legal Disclaimers | Advanced Encryption Standard (AES) is an electronic data encryption specification that was established by the U.S. National Institute of Standards and Technology (NIST). It was subsequently adopted by the US federal government as an approved encryption technology under the FIPS-197 standard. |
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