Introduction
This manual provides comprehensive instructions for the setup, operation, and maintenance of your Logitech K540e Wireless Keyboard and M185 Wireless Mouse Combo. This reliable wireless combo offers a seamless and efficient computing experience with its advanced 2.4 GHz wireless technology, ensuring a stable connection with virtually no delays or dropouts. The compact design and long battery life make it an ideal solution for everyday use.

Image: The Logitech K540e wireless keyboard and M185 wireless mouse, showcasing their full-size layout and ergonomic design.
Setup
1. Unpacking and Contents
Carefully remove all components from the packaging. Ensure the following items are present:
- Logitech K540e Wireless Keyboard
- Logitech M185 Wireless Mouse
- Logitech Unifying Receiver (USB)
- AA Batteries (pre-installed or included)
- User Documentation (this manual)

Image: The Logitech K540e keyboard, M185 mouse, and the small USB Unifying Receiver, ready for setup.
2. Battery Installation
The keyboard and mouse come with pre-installed batteries or require installation.
For the Keyboard:
- Locate the battery compartment on the underside of the keyboard.
- Open the battery compartment cover.
- Insert the AA batteries, ensuring correct polarity (+/-).
- Close the battery compartment cover securely.
For the Mouse:
- Locate the battery compartment on the underside of the mouse.
- Open the battery compartment cover.
- Insert the AA battery, ensuring correct polarity (+/-).
- Close the battery compartment cover securely.
- Turn on the mouse using the On/Off switch located near the battery compartment.
3. Connecting the Unifying Receiver
The Logitech Unifying Receiver connects both your keyboard and mouse to your computer.
- Locate an available USB port on your computer.
- Plug the Logitech Unifying Receiver firmly into the USB port.
- Your computer should automatically detect and install the necessary drivers. This may take a few moments.
- Once installed, the keyboard and mouse should be ready for use.
Note: The mouse features a built-in storage compartment for the Unifying Receiver, making it convenient for transport.
Operating Instructions
Keyboard Functions (K540e)
The K540e keyboard features a full-size layout with a numeric keypad and dedicated media keys for enhanced productivity and convenience.
- Standard Keys: All standard alphanumeric, function (F1-F12), and navigation keys operate as expected.
- Media Keys: Located above the function keys, these allow quick access to:
- Volume control (Mute, Volume Down, Volume Up)
- Play/Pause
- Previous Track
- Next Track
- Calculator Key: A dedicated key to quickly launch the calculator application.
- Battery Status Indicator: An LED light on the keyboard indicates battery status. It will glow green when batteries are good and red when they are low.

Image: An angled view of the Logitech K540e keyboard and M185 mouse, highlighting the full-size keyboard layout and ergonomic mouse design.
Mouse Functions (M185)
The M185 mouse provides precise and comfortable navigation.
- Left Click: Primary button for selection and activation.
- Right Click: Secondary button for context menus and additional options.
- Scroll Wheel: For vertical scrolling. Can also be pressed for middle-click functionality (application dependent).
- On/Off Switch: Located on the underside of the mouse to conserve battery life when not in use.
- Optical Sensor: Provides smooth and accurate tracking on various surfaces.
Maintenance
Cleaning
Regular cleaning helps maintain the performance and longevity of your keyboard and mouse.
- Keyboard: Use a soft, lint-free cloth slightly dampened with water or a mild cleaning solution. Avoid excessive moisture. For debris between keys, use compressed air.
- Mouse: Wipe the surface with a soft, damp cloth. Ensure the optical sensor on the underside is clean and free of dust or lint for optimal tracking.
- Caution: Do not immerse the devices in water or use abrasive cleaners.
Battery Replacement
The keyboard has an estimated 24-month battery life, and the mouse has an estimated 12-month battery life. Replace batteries when the low battery indicator lights up or performance degrades.
- Follow the "Battery Installation" steps outlined in the Setup section.
- Always use fresh, high-quality AA alkaline batteries.
- Dispose of old batteries responsibly according to local regulations.
Troubleshooting
If you encounter issues with your Logitech K540e/M185 combo, refer to the table below for common problems and solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Keyboard/Mouse not responding |
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| Mouse cursor erratic or not moving smoothly |
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| Lag or delayed response |
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Specifications
| Feature | Detail |
|---|---|
| Connectivity | Logitech Advanced 2.4 GHz wireless (Unifying Receiver) |
| Wireless Range | Up to 10 meters (33 feet) |
| Keyboard Battery Life | Up to 24 months (2 x AA batteries) |
| Mouse Battery Life | Up to 12 months (1 x AA battery) |
| Keyboard Layout | Full-size with numeric keypad and media keys |
| Mouse Tracking | Optical |
| Receiver Storage | Built-in compartment in mouse |
| Compatible Devices | Personal Computer |
| Color | Black |
| Dimensions (Keyboard) | Approx. 17.9 x 7.6 x 0.9 inches (457 x 193 x 24 mm) - Estimated based on package dimensions |
| Weight (Keyboard) | Approx. 1.54 pounds (0.7 kg) - Combined weight, estimated for keyboard |
Note: Battery life may vary based on user and computing conditions. Wireless range may vary due to environmental and computing conditions.
Warranty and Support
Warranty Information
Logitech products are manufactured to the highest quality standards. This product is covered by a limited hardware warranty. Please refer to the warranty card included in your product packaging or visit the official Logitech website for detailed warranty terms and conditions specific to your region.
Customer Support
For technical assistance, troubleshooting, or to access the latest drivers and software, please visit the official Logitech support website.
Logitech Support Website: support.logi.com
You can also visit the Logitech Store on Amazon for more product information: Logitech Amazon Store





