The Logitech K400 is a wireless touch keyboard designed for effortless control of smart TVs and PCs. This manual provides detailed guidance for setup and optimal use.
This keyboard offers a convenient, all-in-one solution for media control and general computing tasks, streamlining your digital experience.
What is the Logitech K400?
The Logitech K400 is a versatile wireless keyboard featuring an integrated touchpad, designed to simplify navigation and control of connected devices. It’s a full-sized keyboard offering a familiar typing experience, ideal for use with smart TVs, PCs, and more.
This keyboard provides a convenient alternative to traditional mouse and keyboard combinations, offering a streamlined and user-friendly interface for various applications. It’s a practical solution for home entertainment and everyday computing.
Key Features and Benefits
Key features include a wireless connection via a compact USB receiver, a responsive touchpad for cursor control, and dedicated media keys for easy playback. Benefits encompass simplified TV control, comfortable typing, and effortless navigation.
The K400 offers a convenient all-in-one solution, reducing clutter and enhancing user experience. Its compact design and long battery life contribute to its practicality and portability.

Package Contents
The package includes the Logitech K400 keyboard, a USB receiver, user documentation, and potentially batteries depending on the region. Verify all components are present.
What’s Included in the Box
Upon opening your Logitech K400 package, you should find the wireless keyboard itself, carefully packaged to prevent damage. A small USB unifying receiver is also included, enabling a wireless connection to your computer or device.
Furthermore, the box contains essential documentation, including a quick start guide to help with initial setup and a user manual providing detailed instructions. Batteries may or may not be included, depending on your region’s packaging standards.
Checking for Damage
Before proceeding with setup, carefully inspect the packaging for any visible signs of damage during shipping. Examine the keyboard itself for physical defects, such as cracks or dents.
Verify that the USB receiver is present and undamaged. If any damage is detected, do not attempt to use the device; contact Logitech support immediately to discuss replacement options and ensure a fully functional product.

Setting Up Your K400
To begin, install the required batteries and connect the included USB receiver to your computer. This simple process establishes a wireless connection for immediate use.
Installing Batteries
Locate the battery compartment on the underside of the keyboard. Gently slide the compartment cover open. Insert two AA batteries, ensuring correct polarity as indicated inside the compartment (+ and -). Replace the compartment cover until it clicks securely into place. Proper battery installation is crucial for optimal performance and reliable wireless operation of your Logitech K400.
Connecting the USB Receiver
Plug the USB receiver into an available USB port on your computer. The operating system should automatically detect and install the necessary drivers. Allow a few moments for the installation process to complete. Once installed, the keyboard should automatically connect to the receiver. If it doesn’t, simply restart your computer for a successful connection.

Using the Touchpad
The integrated touchpad functions like a laptop’s, enabling cursor control and gestures for navigation. It offers a seamless and intuitive user experience for various tasks.
Basic Touchpad Gestures
Navigating with the touchpad is intuitive. A single finger swipe moves the cursor, while tapping acts as a left-click. Two-finger scrolling allows vertical movement through documents and webpages.
For right-clicking, tap with two fingers simultaneously. Pinch-to-zoom functionality is also supported, enabling you to easily adjust the magnification level of images and content. These gestures provide a familiar and efficient control method.
Customizing Touchpad Settings
Personalize your experience by adjusting touchpad settings via Logitech software (download required). You can modify cursor speed, scrolling sensitivity, and gesture assignments to suit your preferences.
Disable the touchpad if desired, or adjust tap-to-click settings. Explore options for two-finger scrolling and pinch-to-zoom behavior. These customizations ensure optimal comfort and efficiency during prolonged use.

Keyboard Functions
The K400 features standard keyboard keys for typing, alongside dedicated function keys (F1-F12) for media control and system functions.
Utilize the Alt key for language switching, enhancing usability across various applications and operating systems.
Standard Key Functions
The Logitech K400 operates with familiar key functions, mirroring a traditional keyboard layout. Letters, numbers, and punctuation keys function as expected for text input across various applications.
The spacebar, backspace, enter, and shift keys perform their standard roles, facilitating efficient typing and editing. These core functionalities ensure a seamless transition for users accustomed to conventional keyboard operation, providing a comfortable and intuitive experience.
Function Keys (F1-F12)
The K400’s function keys (F1-F12) offer application-specific controls, often requiring the ‘Fn’ key to be pressed simultaneously for activation. These keys commonly manage media playback – volume, play/pause, and track skipping – enhancing entertainment control.
Other functions may include browser navigation, email access, or application-specific shortcuts, providing quick access to frequently used commands. Their functionality varies depending on the active program.

Troubleshooting Common Issues
If experiencing problems, ensure batteries are correctly installed and the USB receiver is securely connected. Refer to this guide for solutions to unresponsive keyboards or touchpads.
Keyboard Not Responding
First, verify the batteries are fresh and properly inserted with correct polarity. Ensure the USB receiver is firmly plugged into a working USB port on your computer. Try a different USB port to rule out a port issue.
If the issue persists, attempt to re-pair the keyboard with the receiver; consult the full manual for pairing instructions. A simple restart of your computer can also resolve connectivity problems.
Touchpad Not Working
If the touchpad isn’t responding, first check if it’s been accidentally disabled via a function key (refer to the ‘Function Keys’ section). Ensure the touchpad isn’t physically dirty or obstructed.
Try restarting your computer, as this often resolves driver-related issues. If problems continue, consult Logitech’s support website for updated drivers or troubleshooting steps specific to your operating system.
Maintaining Your K400
Regular cleaning with a soft, dry cloth keeps your K400 functioning optimally. Replace batteries when performance diminishes, ensuring continued reliable wireless operation.
Cleaning Instructions
To ensure longevity, regularly clean your Logitech K400. Always disconnect the USB receiver before cleaning. Use a soft, dry cloth to wipe the keyboard and touchpad surfaces. Avoid using liquid cleaners or abrasive materials, as these can damage the device. For stubborn dirt, lightly dampen the cloth with water, then wipe and dry immediately.
Do not spray any liquids directly onto the keyboard. Gently brush away any debris from between the keys. Proper cleaning maintains hygiene and optimal performance.
Battery Replacement
When the keyboard stops responding reliably, replace the batteries. The K400 requires two AA batteries. Locate the battery compartment on the keyboard’s underside and slide open the cover. Remove the old batteries and insert new ones, ensuring correct polarity (+ and -). Replace the compartment cover securely.
Dispose of used batteries responsibly, following local regulations. Using quality batteries will maximize performance and lifespan.

Technical Specifications
The K400 boasts a wireless range of up to 10 meters (33 feet). Its dimensions are 360.6 mm x 149.6 mm x 23.6 mm, with a weight of 570g.
Dimensions and Weight
The Logitech K400 presents a compact and ergonomic design. Its overall dimensions measure 360.6 millimeters in width, 149.6 millimeters in depth, and 23.6 millimeters in height.
Regarding weight, the K400 tips the scales at approximately 570 grams. This provides a stable feel during use, without being overly burdensome for comfortable handling and portability.
Wireless Range
The Logitech K400 utilizes a 2.4 GHz wireless connection, offering a reliable link with its unifying USB receiver. Typically, the operational range extends up to 10 meters (33 feet) in open environments.
However, actual range can vary based on environmental factors like physical obstructions, interference from other wireless devices, and computing environment conditions. Optimal performance is achieved with a clear line of sight.

Logitech Software and Drivers
Logitech offers optional software for customizing your K400. Download and install it from their website to enhance functionality and update firmware regularly.
Downloading and Installing Software
To download the Logitech software, visit the official Logitech website (www.logitech.com/download/k400r) and navigate to the support section for the K400. Locate the software compatible with your operating system.
Download the installer and double-click to begin the installation process. Follow the on-screen instructions, accepting the license agreement and choosing your preferred installation settings. The software enhances customization options.
Updating Firmware
Logitech periodically releases firmware updates to improve the K400’s performance and stability. To check for updates, open the Logitech Options software (if installed) and navigate to the settings for your K400 keyboard.
The software will automatically scan for available updates. If an update is found, follow the on-screen prompts to download and install it, ensuring your keyboard functions optimally.
Language Switching
To change input languages, press the language switch key or the right Alt key on the keyboard for seamless multilingual typing.
Adding more input languages is managed through your computer’s operating system settings.
Using the Language Switch Key
The dedicated language switch key, located on the keyboard, allows you to quickly cycle through your installed input languages. Each press of this key will alternate between the available languages configured within your operating system.
This provides a convenient method for typing in different languages without needing to navigate through system settings. Ensure your desired languages are added to your computer first for the key to function correctly.
Adding Input Languages
To add new input languages, access your computer’s settings. In Windows, navigate to “Time & Language” then “Language.” Add your preferred languages and select desired keyboard layouts. On macOS, go to “System Preferences” then “Keyboard” and add languages under the “Input Sources” tab.
Once added, the language switch key on the K400 will cycle through all installed languages, enabling multilingual typing.

Safety and Regulatory Information
Important safety instructions are included to prevent injury and ensure proper use. This device complies with relevant regulatory standards for safety and electromagnetic compatibility.
Important Safety Instructions
To ensure safe operation, avoid exposing the K400 to excessive moisture or extreme temperatures. Do not disassemble the device, as this voids the warranty and poses a risk of electric shock.
Use only the specified power source (batteries). Keep the device away from liquids and flammable materials. Regularly inspect the USB receiver for damage. Follow all local regulations regarding the disposal of batteries and electronic waste.
Regulatory Compliance
This device complies with FCC Part 15 regulations. Operation is subject to two conditions: it must not cause harmful interference, and it must accept any interference received. Logitech assumes no responsibility for errors in this manual, subject to change without notice.
Refer to the Logitech website for detailed compliance information specific to your region, including certifications and regulatory approvals. This ensures adherence to local standards.
Warranty Information
Logitech provides a limited hardware warranty covering defects in materials and workmanship. To initiate a claim, visit the Logitech website for detailed instructions and terms.
Warranty Coverage
This warranty covers defects in materials and workmanship under normal use for a specified period from the date of purchase. It does not cover issues caused by accidents, misuse, or unauthorized modifications. Logitech will, at its discretion, repair or replace the defective product.
The warranty is non-transferable and applies only to the original purchaser. Proof of purchase is required for all warranty claims. Damage resulting from improper cleaning is excluded.
How to Claim Warranty
To initiate a warranty claim, visit the Logitech website and navigate to the support section. Locate the warranty claim form and complete it with accurate details, including proof of purchase and a description of the defect.
You may be required to ship the product to a designated Logitech service center for inspection. Return shipping costs may apply. Keep your tracking number for claim follow-up.

Frequently Asked Questions (FAQ)
Common questions regarding the K400’s setup, touchpad functionality, and troubleshooting are addressed in the online Logitech support database for quick assistance.
Common User Questions
Users frequently inquire about pairing the K400 with different devices, especially smart TVs and PCs. Another common question involves resolving touchpad responsiveness issues, often solved by checking battery levels or receiver connection.
Many also ask about customizing touchpad gestures and function key assignments. Finally, questions arise regarding language switching methods and accessing detailed troubleshooting guides online.
Where to Find More Support
For extensive assistance, visit the official Logitech website at logitech.com/download/k400r to access downloadable software, drivers, and frequently updated FAQs. The support section offers troubleshooting articles and community forums where users share solutions.
Logitech’s customer support team is also available via online chat or phone for personalized help with your K400 keyboard.