1. Introduction and Overview
The Logitech Wireless Combo MK520 provides a reliable and comfortable wireless solution for your computing needs. This combo includes a full-size keyboard and a contoured laser mouse, both designed for extended use and efficiency. The keyboard features whisper-quiet concave keys and adjustable tilt legs for ergonomic comfort, while the mouse offers soft rubber grips for a hand-friendly experience. Both devices connect wirelessly via a single, tiny Logitech Unifying receiver, simplifying your workspace and allowing for additional compatible peripherals to be connected.
The keyboard also includes convenient one-touch media controls, enhancing your multimedia experience. With intelligent power management and on/off switches, both the keyboard and mouse boast impressive battery life, up to 3 years for the keyboard. This combo is compatible with Windows XP, Vista, and 7 operating systems.

Image: The Logitech Wireless Combo MK520, showcasing the full-size keyboard, contoured mouse, and the compact Unifying receiver.
2. Setup Instructions
2.1. Battery Installation
Before initial use, ensure batteries are correctly installed in both the keyboard and mouse.
- Keyboard: Locate the battery compartment on the underside of the keyboard. Insert the required batteries (4 AAA batteries) according to the polarity indicators (+/-).
- Mouse: Locate the battery compartment on the underside of the mouse. Insert the required batteries (typically AA, though the product description mentions 3 AA alkaline batteries for the combo, the mouse itself usually takes one or two) according to the polarity indicators.

Image: The underside of the Logitech M310 mouse, highlighting the battery compartment and the power switch.
2.2. Connecting the Unifying Receiver
The Logitech Wireless Combo MK520 uses a single Unifying receiver to connect both the keyboard and mouse to your computer.
- Locate the tiny Logitech Unifying receiver. It may be stored inside the mouse's battery compartment for shipping.
- Plug the Unifying receiver into an available USB port on your computer.
- Turn on both the keyboard and the mouse using their respective on/off switches.
- Your devices should automatically connect. If not, download the Logitech Unifying Software from the official Logitech website and follow the on-screen instructions to pair your devices.
3. Operating Instructions
3.1. Keyboard Usage
The MK520 keyboard features a standard 107-key QWERTY layout with additional function keys and media controls.
- Typing: The concave keys are designed for comfortable and quiet typing.
- Adjustable Tilt Legs: On the underside of the keyboard, you will find adjustable tilt legs. Flip these out to raise the keyboard to a more comfortable typing angle, or keep them folded for a flat profile.
- Media Controls: Dedicated media control keys are located at the top of the keyboard for quick access to volume, play/pause, and track navigation.

Image: A user's hands positioned on the Logitech MK520 keyboard, demonstrating its full-size layout and wrist rest area.
3.2. Mouse Usage
The M310 laser mouse is designed for comfortable, precise navigation.
- Grip: The contoured shape and soft rubber grips provide a comfortable fit for your hand.
- Scrolling: Use the scroll wheel for smooth vertical navigation.
- Power Management: To conserve battery life, always turn off the mouse using the on/off switch on its underside when not in use for extended periods.
4. Features
- Full-size Keyboard: Features a standard 107-key QWERTY layout with a numeric keypad.
- Whisper-Quiet Concave Keys: Designed for comfortable and quiet typing, reducing noise and improving tactile feel.
- Adjustable Tilt Legs: Allows users to adjust the keyboard angle for personalized comfort.
- Hand-Friendly Contoured Laser Mouse: Ergonomically shaped with soft rubber grips for comfortable and precise control.
- Tiny Unifying Receiver: A single USB receiver connects both the keyboard and mouse, and can connect up to six compatible Logitech devices.
- 1-Touch Media Controls: Dedicated keys for instant access to volume, mute, play, and pause functions.
- Long Battery Life: Up to 3 years for the keyboard and 18 months for the mouse, thanks to intelligent power management and on/off switches.
- Compatibility: Works with Windows XP, Windows Vista, and Windows 7.
5. Maintenance
5.1. Cleaning
To maintain optimal performance and appearance, regularly clean your keyboard and mouse.
- Use a soft, lint-free cloth slightly dampened with water or a mild cleaning solution.
- Avoid using harsh chemicals, abrasive cleaners, or solvents.
- For the keyboard, you can use compressed air to remove debris from between the keys.
5.2. Battery Replacement
When the battery indicator light on the keyboard or mouse signals low power, or if performance degrades, replace the batteries.
- Keyboard: Requires 4 AAA alkaline batteries.
- Mouse: Requires 1 AA alkaline battery (for M310 mouse, typically).
- Ensure correct polarity when inserting new batteries.
6. Troubleshooting
If you experience issues with your Logitech Wireless Combo MK520, try the following troubleshooting steps:
- No Connection/Lag:
- Ensure the Unifying receiver is securely plugged into a working USB port.
- Check that both the keyboard and mouse are turned on.
- Replace the batteries in both devices.
- Try plugging the Unifying receiver into a different USB port or a different computer to isolate the issue.
- If issues persist, try re-pairing the devices using the Logitech Unifying Software.
- Keys Not Responding:
- Ensure the keyboard is turned on and batteries are fresh.
- Clean around and under the affected keys to remove any debris.
- Mouse Cursor Jumps/Erratic:
- Ensure the mouse sensor is clean and free of obstructions.
- Use the mouse on a clean, non-reflective surface.
- Replace the mouse battery.
7. Specifications
| Feature | Detail |
|---|---|
| Product Dimensions | 8.19 x 2.87 x 18.5 inches |
| Item Weight | 2.2 pounds |
| Item Model Number | MK520 |
| Batteries Required | 4 AAA batteries (for keyboard) |
| Connectivity Technology | USB (via Unifying Receiver) |
| Special Feature | Wireless |
| Compatible Devices | Personal Computer (Windows XP, Vista, 7) |
| Color | Black |
| Manufacturer | Logitech |
8. Warranty and Support
For detailed warranty information, technical support, and additional resources, please visit the official Logitech support website. You can also find drivers, software, and FAQs specific to your MK520 combo there.
Logitech provides customer support to assist with any product-related inquiries or issues you may encounter.





