Dell Pro Wireless KM5221W User Manual
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Dell Pro Wireless KM5221W User Manual

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Dell Pro Wireless
Keyboard and Mouse
KM5221W
User's Guide
Keyboard model: KB3121W
Mouse model: MS3121W
Regulatory model: KB3121Wt/MS3121Wt/SD-8160
Regulatory model: KB3121Wp/MS3121Wp/DGRFEO
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Frequently Asked Questions (10)

  • How do I pair the Dell Pro Wireless KM5221W keyboard and mouse with a USB receiver?

    To pair the Dell Pro Wireless KM5221W keyboard and mouse with a USB receiver:

    1. Detach the receiver tag from the USB receiver.
    2. Install the Dell Universal USB receiver into a USB port on your computer.
    3. Slide the power switch to the right to turn on the keyboard.
    4. Slide the power switch down to turn on the mouse. The keyboard and mouse will then be paired with your USB device.
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  • Why is my Dell Pro Wireless KM5221W keyboard or mouse not functioning, and what are the solutions?

    If your Dell Pro Wireless KM5221W keyboard or mouse is not functioning, consider these solutions:

    1. Check if the batteries are inserted in the correct orientation.
    2. Check the battery level. If using rechargeable batteries, ensure they are fully charged. If batteries are exhausted, replace them with new ones.
    3. Turn off the device, then turn it on. Check if the battery-status light is flashing amber 10 times, indicating low battery power. If batteries are fully depleted, the light will not turn on.
    4. Restart your computer.
    5. Ensure the USB receiver is directly connected to your computer, avoiding port replicators or USB hubs. Change the USB port if necessary.

    For more information, see page 20 of the manual.
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  • How do I turn on the Dell Pro Wireless KM5221W keyboard and mouse?

    To turn on the Dell Pro Wireless KM5221W keyboard and mouse: For the keyboard: Slide the power switch to the right. For the mouse: Slide the power switch down.

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  • What should I do if my Dell Pro Wireless KM5221W devices are unable to pair with my computer or the wireless connection is lost?

    If your Dell Pro Wireless KM5221W devices are unable to pair with your computer or the wireless connection is lost:

    1. Check the battery level. Ensure rechargeable batteries are fully charged or replace exhausted batteries.
    2. Turn off the device, then turn it on. Check if the battery-status light flashes amber 10 times for low power.
    3. Restart your computer.
    4. Ensure the USB receiver is directly connected to your computer, avoiding port replicators or USB hubs.
    5. Change the USB port or insert the USB receiver into another USB port on your computer.
    6. Ensure the distance between your computer and keyboard/mouse is within 10 meters.

    For more information, see page 21 of the manual.
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  • How do I install batteries in the Dell Pro Wireless KM5221W keyboard?

    To install batteries in the Dell Pro Wireless KM5221W keyboard:

    1. Pry open the battery cover using your fingertip.
    2. Install the AAA batteries into the battery compartment.
    3. Replace the battery cover.

    For more information, see page 9 of the manual.
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  • How do I install the battery in the Dell Pro Wireless KM5221W mouse?

    To install the battery in the Dell Pro Wireless KM5221W mouse:

    1. Locate the slot on the side of the mouse cover and pry it open.
    2. Install the AA battery into the battery compartment.
    3. Replace the mouse cover.
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  • What operating systems are compatible with the Dell Pro Wireless KM5221W keyboard and mouse?

    The Dell Pro Wireless KM5221W keyboard and mouse are compatible with: Windows Server 2012; 2012 R2, 2016 (RF receiver only), Windows 8, 32/64-bit, Windows 10, 32/64-bit, Android, Chrome, MAC OS (keyboard), Linux 6.x, Ubuntu 18 and Redhat 8 Enterprise (keyboard), Linux 6.x, Ubuntu (mouse), and Free-DOS (RF receiver only).

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  • What items are included in the box with the Dell Pro Wireless KM5221W?

    The Dell Pro Wireless KM5221W package includes a Keyboard, a Mouse with USB receiver, AAA-type Batteries (for keyboard), an AA-type Battery (for mouse), and Documents.


    For more information, see page 5 of the manual.
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  • How do I remove the USB receiver from the Dell Pro Wireless KM5221W mouse?

    To remove the USB receiver from the Dell Pro Wireless KM5221W mouse, first locate the slot on the side of the mouse cover and pry it open. Once the cover is open, you can then remove the USB receiver from its compartment.


    For more information, see page 11 of the manual.
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  • What is the maximum wireless operation distance for the Dell Pro Wireless KM5221W?

    The maximum wireless operation distance for the Dell Pro Wireless KM5221W is greater than 10 meters (outdoor without any interference). This applies to both the keyboard and mouse.


    For more information, see pages 17 and 19 of the manual.
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Summary of Contents for Dell Pro Wireless KM5221W

  • Page 1 Dell Pro Wireless Keyboard and Mouse KM5221W User’s Guide Keyboard model: KB3121W Mouse model: MS3121W Regulatory model: KB3121Wt/MS3121Wt/SD-8160 Regulatory model: KB3121Wp/MS3121Wp/DGRFEO...
  • Page 2 WARNING: A WARNING indicates a potential for property damage, personal injury, or death. © 2021 Dell Inc. or its subsidiaries. All rights reserved. Dell, EMC, and other trademarks are trademarks of Dell Inc. or its subsidiaries. Other trademarks may be trademarks of their respective owners.

  • Page 3: Table Of Contents

    Dell Peripheral Manager . . . . . . . . . . . . . . . . . . .
  • Page 4 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 Statutory Information .

  • Page 5: What's In The Box

    What’s in the box 1. Keyboard 2. Mouse with USB receiver 3. AAA-type Batteries (for keyboard) 4. AA-type Battery (for mouse) 5. Documents What’s in the box │ 5...

  • Page 6: Features

    Features Keyboard Top view Bottom view 1. Power switch 2. Battery-status light 3. Keyboard feet 4. Battery cover NOTE: Open the battery cover to access the PPID/Regulatory label location. Label location 6 │ Features...

  • Page 7: Mouse

    Mouse Top view Bottom view 1. Left button 2. Scroll wheel 3. Right button 4. Battery-status light 5. Optical sensor 6. Power switch NOTE: Open the mouse cover to access the PPID/Regulatory label location. Label location Features │ 7...

  • Page 8: Dell Peripheral Manager

    • View device information such as firmware version and battery status through the Info tab . • Upgrade the latest firmware updates on your devices . For more information, see Dell Peripheral Manager User’s Guide on the product page at www.dell.com/support . 8 │ Dell Peripheral Manager...

  • Page 9: Setting Up Your Wireless Keyboard

    Setting up your wireless keyboard 1. Using your fingertip, pry open the battery cover . 2. Install the AAA batteries into the battery compartment . Then replace the battery cover . Setting up your wireless keyboard │ 9...
  • Page 10 3. Slide the power switch to the right to turn on the keyboard . 10 │ Setting up your wireless keyboard...

  • Page 11: Setting Up Your Wireless Mouse

    Setting up your wireless mouse 1. Locate the slot on the side of the mouse cover . Using your fingertip, pry open the cover . 2. Remove the USB receiver from its compartment . Setting up your wireless mouse │ 11...
  • Page 12 3. Install the AA battery into the battery compartment . 4. Replace the mouse cover . 12 │ Setting up your wireless mouse...
  • Page 13 5. Slide the power switch down to turn on the mouse . Setting up your wireless mouse │ 13...

  • Page 14: Pairing Your Wireless Keyboard And Mouse

    Pairing your wireless keyboard and mouse Your Dell wireless keyboard and mouse can be paired with devices using USB receiver . You can pair and switch between a laptop, desktop, and a compatible mobile device . Pairing with a USB receiver NOTE: You can connect a device to your wireless keyboard and mouse using the Dell Universal pairing.
  • Page 15 3. Slide the power switch to the right to turn on the keyboard . Then slide the power switch down to turn on the mouse . The keyboard and mouse are paired with your USB device . Pairing your wireless keyboard and mouse │ 15...

  • Page 16: Keyboard Specifications

    Keyboard Specifications General Model number KB3121W Connection type Wireless (2 . 4 GHz with nano receiver) System requirement • Windows Server 2012; 2012 R2, 2016 (RF receiver only) • Windows 8, 32/64-bit • Windows 10, 32/64-bit • Android • Chrome •...

  • Page 17: Environmental

    Environmental Temperature: Operating -10°C to 50°C (14°F to 122°F) Storage -40°C to 65°C (-40°F to 149°F) Storage humidity 95% maximum relative humidity; non-condensing Wireless RF resolution 2 . 4 GHz RF Operating channel 5 channels for GFSK modulation with 1 Mbps Operation distance >...

  • Page 18: Mouse Specifications

    Mouse Specifications General Model number MS3121W Connection type Wireless (2 . 4 GHz with nano receiver) System requirement • Windows Server 2012; 2012 R2, 2016 (RF receiver only) • Windows 8, 32/64-bit • Windows 10, 32/64-bit • Android • Chrome •...

  • Page 19: Environmental

    Environmental Temperature: Operating -10°C to 50°C (14°F to 122°F) Storage -40°C to 65°C (-40°F to 149°F) Storage humidity 95% maximum relative humidity; non-condensing Wireless RF resolution 2 . 4 GHz RF Operating channel 5 channels for GFSK modulation with 1 Mbps Operation distance >...
  • Page 20 Troubleshooting Problems Possible solutions Keyboard/mouse is not 1. Check if the batteries are inserted in the correct functioning orientation . The batteries “+” and “-” ends should be placed as indicated on the battery compartment . 2. Check the battery level . •...
  • Page 21 Problems Possible solutions Unable to pair the keyboard/ 1. Check the battery level . mouse with your computer • If the device uses the rechargeable batteries, ensure that the batteries are fully charged . • If the batteries are exhausted, replace them with a new ones .
  • Page 22 Problems Possible solutions Troubleshooting a slow 1. Ensure that the sensor is not obstructed or dirty . moving cursor 2. Glass or very smooth glossy surfaces are not suitable for the mouse sensor to capture the mouse movement . Using a dark colored fabric mouse pad can improve the tracking .
  • Page 23 Dell’s end user contract terms . Dell may also provide an additional hardware warranty – full details of the Dell end user contract and warranty terms can be found by going to Dell.com/terms, selecting your country from the list at the bottom of the “home”...

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