Logitech K400 Plus User Manual: A Comprehensive Guide (Updated 12/22/2025)
Today’s date is 12/22/2025 21:54:44. This guide simplifies troubleshooting, offering valuable insights for common issues with your Logitech K400 Plus.
Welcome to the world of effortless control! The Logitech K400 Plus is designed for a relaxed, comfortable computing experience, particularly suited for use in the living room. This wireless keyboard and touchpad combination offers a streamlined solution for navigating your smart TV, PC, or other connected devices.
This user manual provides a comprehensive, step-by-step guide to help you quickly set up and maximize the potential of your K400 Plus. From initial setup and connecting to various devices, to understanding the keyboard layout and customizing settings, we’ll cover everything you need. Troubleshooting tips are also included to resolve common issues, ensuring a smooth and enjoyable user experience.
What’s in the Box? ౼ Package Contents
Upon opening your Logitech K400 Plus package, you should find the following items carefully included. First, the Logitech K400 Plus Keyboard itself, featuring an integrated touchpad. Secondly, you’ll receive a small Unifying Receiver – this allows for a reliable wireless connection to your computer.
Additionally, the package contains two AA batteries to power the keyboard, pre-installed for your convenience. A user documentation booklet is also included, offering a quick start guide and important safety information. Finally, you’ll find a warranty information card detailing the terms and conditions of your product’s coverage. Please verify all components are present and undamaged.
System Requirements & Compatibility
The Logitech K400 Plus is designed for broad compatibility, ensuring seamless integration with various devices. For Windows users, it requires Windows 7, 8, 10, or 11, with a free USB port for the Unifying Receiver. Chrome OS compatibility is also excellent, functioning with Chrome OS version 40 or later.
Furthermore, the K400 Plus works effectively with Smart TVs supporting HID profiles. It’s also compatible with Android devices (version 5.0 or higher) and many Linux distributions. A USB port or Bluetooth connectivity is needed for these systems. Ensure your operating system is updated for optimal performance and functionality.
Getting Started: Initial Setup
Welcome to a streamlined experience! Setting up your Logitech K400 Plus is remarkably simple. Begin by unpacking the keyboard and the included Unifying Receiver. Before proceeding, ensure your device meets the System Requirements. The initial setup involves installing batteries (see section Installing Batteries) and connecting the Unifying Receiver to a free USB port on your computer or TV.
Once connected, the keyboard should automatically pair. If not, refer to the Connecting to Devices section for specific pairing instructions. This step-by-step guide ensures effortless operation, allowing you to quickly enjoy the convenience of your new keyboard.
Installing Batteries
To begin, locate the battery compartment on the underside of the Logitech K400 Plus. Gently slide the compartment cover open. Insert two AA batteries, ensuring correct polarity as indicated by the markings inside the compartment – positive (+) and negative (-). It’s crucial to use fresh batteries for optimal performance and longevity.
Once the batteries are securely in place, carefully slide the compartment cover back until it clicks shut. Proper battery installation is essential for the keyboard to function correctly. Always adhere to Safety Precautions when handling batteries.
Connecting the Unifying Receiver
The Logitech K400 Plus utilizes a small Unifying Receiver for a reliable wireless connection. Locate the USB receiver and plug it into an available USB port on your computer. Ensure the receiver is fully inserted for a secure connection. Your computer should automatically detect the receiver and install the necessary drivers.
If drivers aren’t automatically installed, download and install Logitech Options+ Software. This software simplifies the connection process and allows for customization. A successful connection is indicated by a solid light on the receiver. Follow the Step-by-Step Guide within the software for assistance.
Understanding the Keyboard Layout
The Logitech K400 Plus features a familiar keyboard layout designed for comfortable and efficient use. It includes standard alphanumeric keys, function keys, and dedicated media control keys. Take a moment to familiarize yourself with the key placement before initial use. The integrated touchpad offers gesture control for navigation.
This manual breaks down the Key Functions & Descriptions, detailing each key’s purpose. The layout prioritizes ease of use, especially when paired with a smart TV or streaming device. Refer to the following sections for detailed explanations of specific key functionalities and the touchpad’s capabilities.
Key Functions & Descriptions
The Logitech K400 Plus keyboard boasts standard keys for typing, alongside function keys (F1-F12) offering shortcuts for common actions. The ‘Home’ key navigates to your homepage, while the ‘Back’ key allows you to retrace your steps. Dedicated app keys provide quick access to frequently used programs.
The keyboard’s layout is designed for intuitive operation. The left and right arrow keys facilitate navigation, and the ‘Enter’ key confirms selections. Understanding these fundamental key functions will significantly enhance your overall user experience, especially when navigating streaming services or web browsing.
Media Control Keys
The Logitech K400 Plus features dedicated media control keys for seamless entertainment. These include volume up/down, mute, and play/pause buttons, allowing effortless audio management. Skip forward and backward keys enable convenient navigation through playlists or videos.
These controls are strategically positioned for easy access during media consumption. Enjoy quick adjustments without interrupting your viewing experience. The responsive design ensures reliable operation, enhancing your overall enjoyment of movies, music, and other digital content. These keys streamline your interaction with media applications.
Connecting to Devices
The Logitech K400 Plus offers versatile connectivity options for various devices. It seamlessly pairs with Windows computers via the included Unifying Receiver or Bluetooth. Connecting to Smart TVs is also straightforward, utilizing Bluetooth for wireless control. Furthermore, compatibility extends to Android and Linux systems, enhancing its usability.
Ensure your device supports Bluetooth for wireless connections. The Unifying Receiver provides a stable connection for Windows. Detailed pairing instructions for each operating system are provided in subsequent sections, ensuring a smooth and hassle-free setup process for optimal performance.
Pairing with Windows
To pair the Logitech K400 Plus with Windows, first, ensure Bluetooth is enabled on your computer. If using the Unifying Receiver, simply plug it into a USB port – Windows should automatically detect and install the necessary drivers. For Bluetooth pairing, navigate to Windows Settings, select ‘Bluetooth & devices’, and activate Bluetooth.
Place the keyboard in pairing mode by pressing the connect button on the receiver or keyboard. Select ‘Add device’ and choose the K400 Plus from the list of available devices. Follow any on-screen prompts to complete the pairing process, establishing a reliable connection.
Pairing with Smart TVs
Pairing your Logitech K400 Plus with a Smart TV is straightforward. First, put your TV into pairing mode – this is usually found within the TV’s settings menu, under Bluetooth or Input Devices. Then, place the K400 Plus into pairing mode by pressing the connect button on the Unifying Receiver or the keyboard itself.
Your TV should then detect the K400 Plus. Select it from the list of available devices. You may be prompted for a pairing code (typically ‘0000’). Once connected, enjoy effortless navigation and control of your Smart TV’s features.
Pairing with Android & Linux
To pair with Android, navigate to your device’s Bluetooth settings and ensure Bluetooth is enabled. Put the K400 Plus into pairing mode by pressing the connect button on the Unifying Receiver or the keyboard. Your Android device should detect the keyboard; select it to initiate pairing. You might be asked to confirm a pairing code.
For Linux, access Bluetooth settings via your distribution’s control panel. Scan for devices, put the K400 Plus in pairing mode, and select it when it appears. Follow any on-screen prompts to complete the connection process.
Using the Touchpad
The Logitech K400 Plus features a responsive touchpad for cursor control. Navigate effortlessly by simply gliding your finger across the surface. Left-clicking is performed with a single tap, while right-clicking requires a two-finger tap. Utilize two-finger scrolling for smooth vertical movement through documents and web pages.
The touchpad’s sensitivity can be adjusted using the Logitech Options+ software, allowing you to customize the experience to your preference. Experiment with different settings to find what feels most natural and comfortable for extended use.
Touchpad Gestures (Scrolling, Clicking)
The K400 Plus touchpad supports intuitive gestures for enhanced navigation. Single-finger sliding enables smooth scrolling through web pages, documents, and applications. A single tap on the touchpad surface functions as a left-click, selecting items and activating links. To perform a right-click, simultaneously tap the touchpad with two fingers.
Precise control is achievable with practice. Experiment with varying pressure and speed to refine your gesture execution. These gestures streamline interaction, offering a convenient alternative to a traditional mouse for comfortable operation.
Customizing Touchpad Sensitivity
Adjusting touchpad sensitivity allows for a personalized user experience. Utilize the Logitech Options+ software to fine-tune the touchpad’s responsiveness to your preferred level. Higher sensitivity settings require less physical movement for cursor control, ideal for precision tasks. Conversely, lower settings demand more deliberate gestures, preventing accidental movements.
Experiment with different sensitivity levels to discover what best suits your workflow and comfort. The software provides a visual slider for easy adjustment and immediate feedback. Regularly recalibrate sensitivity for optimal performance.
Logitech Options+ Software
Logitech Options+ software unlocks the full potential of your K400 Plus. This powerful tool enables extensive customization, going beyond standard keyboard functionality. Download and install Options+ to personalize key assignments, adjust touchpad sensitivity, and create custom profiles for different applications.
The intuitive interface simplifies the process of tailoring the keyboard to your specific needs. Benefit from enhanced control and improved productivity through customized settings. Regularly check for software updates to ensure optimal performance and access to new features.
Downloading & Installing Logitech Options+
To begin customizing your K400 Plus, download the Logitech Options+ software from the official Logitech website. Ensure you select the version compatible with your operating system (Windows or macOS). Once downloaded, double-click the installer file to initiate the installation process.
Follow the on-screen prompts, accepting the license agreement and choosing your preferred installation location. The software may require a system restart upon completion. After restarting, launch Logitech Options+ and follow the in-app instructions to connect your K400 Plus keyboard for personalized settings.
Customizing Key Assignments
Logitech Options+ allows extensive key customization for the K400 Plus. Within the software, select your keyboard and navigate to the “Buttons” or “Key Assignments” section. Here, you can remap individual keys to perform different functions, launch applications, or execute custom macros.
Experiment with assigning media controls to unused keys, or create shortcuts for frequently used commands. The software provides a visual interface for easy remapping. Save your custom profiles for different applications or users, ensuring a tailored experience. Remember to test your new assignments thoroughly!
Troubleshooting Common Issues
Encountering problems with your K400 Plus? This section addresses frequent concerns. If the keyboard isn’t connecting, ensure batteries are fresh and the Unifying Receiver is securely plugged in. Try a different USB port. For a touchpad that isn’t working, verify it’s enabled in settings and update Logitech Options+.
Battery life issues often stem from low-quality batteries or prolonged use. Replace batteries and consider using rechargeable options. If problems persist, consult the FAQ or contact Logitech support for further assistance. A simple restart can often resolve minor glitches.
Keyboard Not Connecting
If your K400 Plus isn’t connecting, begin by verifying the batteries are correctly installed and have sufficient charge. Ensure the Unifying Receiver is firmly plugged into a working USB port on your computer – try a different port if necessary. Confirm the receiver isn’t obstructed by other devices.
Restarting your computer can often resolve connection issues. Within Logitech Options+ software, check if the keyboard is recognized. If not, attempt to pair it again. If problems continue, try the receiver on another computer to isolate the issue.
Touchpad Not Working
Should the touchpad on your K400 Plus become unresponsive, first ensure it isn’t physically disabled via a function key (check for an icon on the keyboard). Within Logitech Options+ software, verify the touchpad is enabled and sensitivity settings are appropriately configured. A restart of your computer can often resolve driver-related issues.
Try cleaning the touchpad surface with a soft, dry cloth. If the problem persists, re-pair the keyboard. Check for software updates for both the keyboard and your operating system, as outdated drivers can cause conflicts.
Battery Life Issues
Experiencing short battery life with your Logitech K400 Plus? First, confirm you’re using fresh, high-quality batteries. Alkaline batteries generally offer the best performance. Within Logitech Options+, check for power-saving settings that might be enabled. Frequent use of the backlit keys (if applicable) will significantly reduce battery duration;
Ensure the keyboard is fully powered off when not in use. Avoid extreme temperatures, as they can impact battery performance. If issues continue, try a different set of batteries to rule out a battery defect.
Battery Replacement & Management
The Logitech K400 Plus requires two AA batteries for operation. To replace them, locate the battery compartment on the keyboard’s underside. Slide the compartment cover open and remove the old batteries. Insert new AA batteries, ensuring correct polarity (+ and -) as indicated inside the compartment. Close the cover securely.
For optimal performance, use alkaline or lithium AA batteries. Avoid mixing old and new batteries. When storing the keyboard for extended periods, remove the batteries to prevent potential leakage and corrosion. Regularly check battery levels within Logitech Options+.
Cleaning & Maintenance
To maintain your Logitech K400 Plus, regularly clean it with a soft, dry cloth. Avoid using liquid cleaners or abrasive materials, as these can damage the surface. For stubborn dirt, lightly dampen the cloth with water and wring it out thoroughly before wiping.
Pay particular attention to the touchpad, ensuring it remains free of dust and debris. Do not spray any liquids directly onto the keyboard. Periodically check the Unifying receiver for dust accumulation and gently clean it if necessary. Proper cleaning ensures optimal performance and longevity of your device.
Safety Precautions
Important safety guidelines for indoor use only. Do not expose the Logitech K400 Plus to extreme temperatures or humidity. Avoid dropping or subjecting the keyboard to strong impacts, as this may cause damage. Keep the device away from liquids to prevent electrical shock or malfunction.
Do not attempt to disassemble or repair the keyboard yourself; contact Logitech support for assistance. Ensure the Unifying receiver is securely connected to prevent accidental disconnection. Follow all local regulations regarding the disposal of batteries and electronic waste.
Regulatory Information & Compliance
This device complies with part 15 of the FCC Rules. Operation is subject to two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Logitech complies with all applicable international regulations regarding electromagnetic compatibility, safety, and environmental standards. For detailed compliance information, including certifications and declarations of conformity, please visit the Logitech website. This ensures responsible manufacturing and adherence to global standards.
Warranty Information
Logitech provides a one-year limited hardware warranty from the date of original purchase. This warranty covers defects in materials and workmanship under normal use. It does not cover damage from misuse, accidents, or unauthorized modifications.
To obtain warranty service, contact Logitech customer support with your proof of purchase. Logitech, at its discretion, will repair or replace the defective product. This warranty gives you specific legal rights, and you may have other rights which vary by location. See our website for full details and terms.
Frequently Asked Questions (FAQ)
Q: Why isn’t my keyboard connecting? Ensure batteries are fresh and the Unifying Receiver is securely plugged in. Try re-pairing the device. Q: The touchpad isn’t responding. Check touchpad settings in Logitech Options+ software. Update the software if needed. Q: How do I improve battery life? Reduce backlight brightness and power off when not in use.
Q: Can I use this with a Mac? Yes, with appropriate software installation. Q: Is the receiver compatible with other Logitech devices? It supports multiple devices, but check compatibility. For further assistance, visit Logitech’s support website.
Advanced Settings (Logitech Options+)
Customize Key Assignments: Within Logitech Options+, remap keys to suit your workflow. Create custom shortcuts for frequently used applications or functions; Touchpad Customization: Adjust scrolling speed, gesture sensitivity, and enable/disable specific gestures. Fine-tune the touchpad experience for optimal control.
Application-Specific Settings: Configure unique key assignments and touchpad behaviors for individual applications. Enhance productivity by tailoring the keyboard to each program. Explore profiles for different users or usage scenarios. Regularly update Logitech Options+ for new features and improvements.
Using the K400 Plus with Streaming Devices
Seamless Integration: The Logitech K400 Plus excels as a companion for streaming devices like Roku, Apple TV, and Amazon Fire TV. Its wireless design eliminates cable clutter, providing a clean entertainment setup. Effortless Navigation: Utilize the integrated touchpad for precise cursor control within streaming menus. Enjoy smooth scrolling and intuitive selection of content.
Media Key Convenience: Dedicated media control keys allow for quick playback, volume adjustment, and channel switching. Simplify your streaming experience with dedicated hardware controls. Ensure your streaming device supports HID profiles for optimal compatibility.
Optimizing Performance for Smart TVs
Enhanced TV Experience: The Logitech K400 Plus significantly improves navigation on Smart TVs, offering a more responsive and user-friendly interface than standard remote controls. Touchpad Precision: Leverage the touchpad’s sensitivity settings within Logitech Options+ software to fine-tune cursor movement for your specific TV model and viewing distance.
Minimize Interference: Position the Unifying Receiver close to the TV to ensure a stable wireless connection. Avoid obstructions that may interfere with the signal. Regularly check for firmware updates for both the keyboard and your Smart TV to maintain optimal compatibility and performance.
Resetting the Keyboard
Restoring Default Settings: If you encounter persistent issues, resetting the Logitech K400 Plus to its factory defaults can resolve many problems. Reset Procedure: Locate the small reset button on the underside of the keyboard, typically near the battery compartment. Use a paperclip or similar tool to press and hold this button for approximately three seconds.
Re-Pairing Required: After resetting, you’ll need to re-pair the keyboard with your computer or Smart TV using the Unifying Receiver. This process is similar to the initial setup described earlier in this manual. Ensure the receiver is properly connected before attempting to re-pair.
Unifying Receiver Troubleshooting
Connection Issues: If the receiver isn’t recognized, try a different USB port on your computer. Avoid USB hubs initially, connecting directly to the computer. Driver Problems: Ensure you have the latest Logitech Options+ software installed, as it includes necessary drivers for the receiver. Reinstalling the software can often resolve driver conflicts.
Interference: Wireless interference can disrupt the connection. Move the receiver away from other wireless devices and metal objects. Receiver Replacement: If problems persist, consider contacting Logitech support for a potential receiver replacement, as the receiver itself may be faulty.
Where to Find Additional Support
Logitech Support Website: Visit the official Logitech support website for extensive FAQs, troubleshooting guides, and downloadable resources specifically for the K400 Plus. You can find this at Logitech’s official domain. Logitech Options+ Help: Within the Logitech Options+ software, access built-in help documentation and support articles tailored to keyboard customization.
Community Forums: Explore Logitech’s online community forums to connect with other users, share experiences, and find solutions to common problems. Contact Logitech Directly: For personalized assistance, contact Logitech customer support via phone or online chat for direct troubleshooting.
Technical Specifications
Keyboard Dimensions: 360.6 mm x 143.6 mm x 23.6 mm (14.2 in x 5.65 in x 0.93 in). Weight: 560 g (1.23 lbs) with batteries. Wireless Range: Up to 10 meters (33 feet) line of sight. Wireless Technology: 2.4 GHz with Advanced 2.4 GHz and Bluetooth. Touchpad Dimensions: 76 mm x 51 mm (3.0 in x 2.0 in).
Battery Life: Up to 18 months (battery life may vary based on usage). Battery Type: 2 x AA batteries. Keys: 104 keys (QWERTY layout). System Requirements: Windows 10 or later, Chrome OS, Linux, Smart TV.