Dell Pro Wireless Keyboard and Mouse KM5221W Usage and Troubleshooting Guide

Check if the batteries are inserted in the correct orientation. The batteries "+" and "-" ends should be placed as indicated on the battery compartment.

Check the battery level.

• If the device uses the rechargeable batteries, ensure that the batteries are fully charged.
• If the batteries are exhausted, replace them with new ones.

Turn off the device, and then turn it on. Check if the battery-status light is flashing amber 10 times, indicating that the battery power is low. If the batteries are fully depleted, the battery-status light does not turn on.

Restart your computer.

Ensure that the USB receiver is directly connected to your computer

• Avoid using the port replicators, USB hubs, and so on.
• Change the USB port.

Check the battery level.

• If the device uses the rechargeable batteries, ensure that the batteries are fully charged.
• If the batteries are exhausted, replace them with new ones.

Turn off the device, and then turn it on. Check if the battery-status light is flashing amber 10 times, indicating that the battery power is low. If the batteries are fully depleted, the battery-status light does not turn on.

Restart your computer.

Ensure that the USB receiver is directly connected to your computer. Avoid using the port replicators, USB hubs, and so on.

Change the USB port or insert the USB receiver into another USB port on your computer.

Ensure that the distance between your computer and keyboard and mouse is within 10 meters.

Check the battery level

• If the device uses the rechargeable batteries, ensure that the batteries are fully charged.
• If the batteries are exhausted, replace them with new ones.

Turn off the device, and then turn it on. Check if the battery-status light is flashing amber 10 times, indicating that the battery power is low. If the batteries are fully depleted, the battery-status light does not turn on

Restart your computer.

Ensure that the distance between your computer and keyboard and mouse is within 10 meters

Ensure that the sensor is not obstructed or dirty.

Glass or 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

Change the mouse settings to adjust the pointer speed.

Click or tap the tab that matches the operating system installed on your computer and perform the steps within that section to change the settings.

• In the Search box, type main.cpl. The Mouse Properties dialog box appears.
• Click or tap main.cpl in the list of programs.
• Click or tap the Pointer Options tab. In the Motion section, move the slider to adjust the pointer speed to the wanted level.
• Click or tap OK.