k400 plus manual
Logitech K400 Plus Manual: A Comprehensive Guide (Updated 12/24/2025)
This manual provides detailed instructions for the Logitech K400 Plus, a versatile wireless keyboard with an integrated touchpad, ideal for home theater and smart TV use.
The Logitech K400 Plus Wireless Touch Keyboard represents a streamlined solution for controlling your connected devices from a distance. Released as an updated version of the popular K400, it combines the functionality of a full-sized keyboard with an integrated touchpad, eliminating the need for a separate mouse. This makes it particularly well-suited for use with smart TVs, home theater PCs (HTPCs), and even sim racing setups, offering convenient navigation and control.
Its compact design and wireless connectivity provide flexibility and ease of use, while the responsive touchpad and customizable function keys enhance the user experience. The K400 Plus has remained a popular choice for over a decade, praised for its reliability and versatility. This manual will guide you through setup, usage, troubleshooting, and maintenance.
What’s in the Box?
Upon opening your Logitech K400 Plus packaging, you should find the following components carefully included. First, the primary item: the K400 Plus Wireless Touch Keyboard itself, featuring the integrated touchpad and full-sized QWERTY layout. Secondly, a tiny USB Unifying Receiver is present, enabling a wireless connection to your computer or compatible device. You’ll also receive documentation, specifically a quick-start guide to assist with initial setup and basic operation.
Additionally, a warranty information leaflet is included, detailing the terms and conditions of your product’s coverage. Please verify that all these items are present and undamaged. If anything is missing or appears faulty, contact Logitech support immediately for assistance and potential replacement.
System Requirements
To ensure seamless functionality of your Logitech K400 Plus, verify your system meets these minimum requirements. For Windows users, Windows 7 or later is necessary, alongside a readily available USB port for the Unifying Receiver. Mac OS users require Mac OS X 10.7 or a newer version, also with a free USB port. Chrome OS compatibility is confirmed, needing Chrome OS version 27 or higher.
Bluetooth connectivity demands a device supporting Bluetooth Low Energy (BLE) technology. A stable internet connection is recommended for optional software downloads and firmware updates. These requirements guarantee optimal performance and access to all features of the K400 Plus keyboard.
Setting Up Your K400 Plus
This section details the straightforward process of getting your K400 Plus ready for use, covering unboxing, battery installation, and connecting via USB or Bluetooth.
Unboxing and Initial Inspection
Carefully remove the K400 Plus keyboard from its packaging. Inspect the box contents to ensure all components are present: the keyboard itself, the USB receiver (typically stored within the battery compartment), and this user manual.
Visually examine the keyboard for any signs of physical damage incurred during shipping, such as cracks, dents, or loose keys. Pay close attention to the trackpad surface, ensuring it’s free from scratches or debris. Verify the battery compartment is securely closed.
If any damage is detected, immediately contact Logitech support for assistance. Retain the original packaging for potential returns or warranty claims. A quick initial inspection prevents issues later.
Installing Batteries
Locate the battery compartment on the underside of the K400 Plus keyboard. Gently slide the compartment cover open, typically in the direction indicated by an arrow. Insert two AA batteries, ensuring correct polarity as indicated by the “+” and “-” symbols inside the compartment.
Use fresh, high-quality AA batteries for optimal performance and longevity. Avoid mixing old and new batteries, or different battery types. Once the batteries are securely in place, slide the compartment cover closed until it clicks into position.
The keyboard should now power on automatically. If it doesn’t, double-check the battery installation and ensure the batteries are making good contact.
Connecting to Your Device (USB Receiver)
Locate the Logitech Unifying Receiver. It’s a small USB dongle included in the box. Plug the receiver into an available USB port on your computer or device. Ensure the port provides a stable connection. Allow a few moments for your operating system to detect and install the necessary drivers.
The K400 Plus should automatically pair with the receiver. If it doesn’t, press the Connect button (if present) on the bottom of the keyboard. The keyboard’s LED indicator should blink during the pairing process and become solid when connected.
If pairing fails, try a different USB port or restart your computer.
Pairing with Bluetooth Devices
To connect via Bluetooth, first, ensure your device supports Bluetooth connectivity and is discoverable. Press and hold the Bluetooth pairing button on the K400 Plus – consult the keyboard’s diagram for its exact location. The LED indicator will flash, signaling pairing mode.
On your device, scan for available Bluetooth devices. Select “Logitech K400 Plus” from the list. You may be prompted to enter a pairing code; if so, try “0000” or consult the documentation for your device.
Once paired, the LED indicator will become solid.
Understanding the Keyboard Layout
The K400 Plus features a compact keyboard, integrated trackpad, and dedicated media keys for convenient control of your entertainment experience.
Standard Keys and Functions
The Logitech K400 Plus boasts a familiar keyboard layout, ensuring a quick and easy transition for most users. It includes all the essential keys you’d expect – alphanumeric keys for typing, function keys (F1-F12) for various shortcuts, and modifier keys like Shift, Ctrl, and Alt.
The keyboard supports standard typing functions, allowing for efficient document creation, web browsing, and email correspondence. Dedicated keys for backspace, delete, enter, and spacebar are strategically positioned for comfortable use.
Furthermore, the K400 Plus incorporates a number pad, providing convenient access to numerical input. This is particularly useful for data entry or financial tasks. The key travel and responsiveness are designed for a comfortable and accurate typing experience.
Trackpad Features and Gestures
The integrated trackpad on the Logitech K400 Plus offers a convenient alternative to a traditional mouse, especially when space is limited. It supports multi-finger gestures for enhanced navigation and control. Single-finger dragging moves the cursor, while two-finger scrolling allows for vertical and horizontal scrolling through web pages and documents.
Three-finger swiping can be customized to switch between applications or navigate through open windows. The trackpad also supports tap-to-click functionality, eliminating the need for physical buttons.
Sensitivity settings can be adjusted to personalize the trackpad’s responsiveness to your preferences, ensuring smooth and precise cursor control.
Media Control Keys
The Logitech K400 Plus features dedicated media control keys conveniently located for easy access. These keys allow you to quickly play, pause, stop, and skip tracks in your favorite music or video applications without interrupting your workflow. Volume control buttons are also included for adjusting the audio level directly from the keyboard.
A dedicated mute button provides instant audio silencing, useful for calls or presentations.
These media keys are universally compatible, functioning seamlessly with popular media players like Windows Media Player, Spotify, and YouTube.
Customizable Function Keys
The Logitech K400 Plus incorporates function keys (F1-F12) that offer customizable shortcuts to enhance productivity. While pre-programmed with standard functions like browser navigation and volume control, these keys can be remapped using Logitech Options software.
Logitech Options allows users to assign custom actions, launch applications, or execute macros to each function key, tailoring the keyboard to individual needs.
This customization extends to media controls, allowing for personalized shortcuts for frequently used applications.
Creating profiles within Logitech Options enables different key mappings for various applications, maximizing efficiency.
Troubleshooting Common Issues
This section addresses frequent problems with the K400 Plus, including connection difficulties, unresponsive trackpads, battery concerns, and potential driver-related issues.
Keyboard Not Connecting
If your Logitech K400 Plus isn’t connecting, first ensure the USB receiver is firmly plugged into a working USB port on your device. Try a different port to rule out a faulty connection. Verify the keyboard has sufficient battery power; low batteries can cause intermittent or complete connection loss. For Bluetooth connections, confirm Bluetooth is enabled on your device and the K400 Plus is in pairing mode.
Remove any potential interference from other wireless devices. If using the USB receiver, attempt re-pairing by removing and re-inserting the receiver. Check Device Manager (Windows) or System Information (Mac) to see if the keyboard is recognized. A restart of your computer can often resolve temporary connection glitches. Finally, consider testing the keyboard on another device to isolate the problem.
Trackpad Not Responding
If the trackpad on your Logitech K400 Plus isn’t responding, begin by ensuring your fingers are clean and slightly damp for optimal tracking. Check the trackpad settings within your operating system to confirm it isn’t accidentally disabled. Try gently cleaning the trackpad surface with a soft, lint-free cloth to remove any debris or oils that might interfere with its function.
Restarting your computer can often resolve software-related trackpad issues. Verify that the Logitech Options software (if installed) is up-to-date, as outdated software can cause compatibility problems. Experiment with different trackpad sensitivity settings within the Logitech Options software or your operating system’s settings. If the issue persists, test the keyboard on another device to determine if the problem lies with the keyboard itself.
Battery Life Concerns
The Logitech K400 Plus utilizes 2 AAA batteries, and battery life can vary depending on usage patterns. To maximize battery life, reduce backlight brightness if applicable, and minimize prolonged periods of inactivity where the keyboard remains connected but unused. Ensure you are using high-quality alkaline or rechargeable AAA batteries for optimal performance.
Regularly check the battery level indicator within your operating system’s Bluetooth settings or Logitech Options software. When the battery level is low, replace both batteries simultaneously with fresh ones to avoid potential performance issues. Avoid mixing old and new batteries. Consider using rechargeable batteries to reduce environmental impact and long-term costs.
Driver Issues and Updates
Generally, the Logitech K400 Plus is a plug-and-play device and doesn’t require extensive driver installation for basic functionality. However, to unlock advanced features like customizable function keys and gesture control, downloading and installing the Logitech Options software is recommended. This software provides the latest drivers and firmware updates for your keyboard.
If you experience connectivity issues or erratic behavior, ensure you have the newest version of Logitech Options installed. Check Logitech’s official website for available updates. Occasionally, conflicts with existing software may occur; try restarting your computer or temporarily disabling other input devices. If problems persist, uninstalling and reinstalling Logitech Options can often resolve driver-related issues.
Advanced Features & Usage
Explore the K400 Plus’s full potential with customizable trackpad sensitivity, smart TV control, HTPC integration, and even sim racing applications for enhanced experiences.
Optimizing Trackpad Sensitivity
The Logitech K400 Plus offers adjustable trackpad sensitivity to cater to individual preferences and usage scenarios. Users can fine-tune the cursor speed and responsiveness through the Logitech Options software, available for download on the Logitech website.
Within the software, you’ll find a dedicated section for trackpad settings, allowing you to select from pre-defined sensitivity levels or create a custom profile. Higher sensitivity settings result in faster cursor movement with minimal physical input, ideal for large screens or quick navigation. Conversely, lower sensitivity settings provide more precise control, beneficial for detailed tasks or smaller displays.
Experimenting with different settings is crucial to find the optimal balance between speed and accuracy. Consider your typical usage – whether it’s browsing the web, controlling media, or gaming – and adjust the sensitivity accordingly. Regularly revisiting these settings ensures a consistently comfortable and efficient user experience.
Using the K400 Plus for Smart TV Control
The Logitech K400 Plus excels as a smart TV controller, offering a convenient alternative to traditional remote controls. Its wireless connectivity and integrated trackpad simplify navigation through streaming services, web browsing, and smart TV menus.
Pairing is straightforward: simply plug the USB receiver into your smart TV (if supported) or connect via Bluetooth. The trackpad allows for precise cursor control, eliminating the need for cumbersome directional buttons. Media control keys provide quick access to play/pause, volume, and mute functions.
For TVs without native keyboard support, the K400 Plus enables effortless text input for searches and logins. Its compact design and comfortable layout make it a pleasure to use during extended viewing sessions, enhancing the overall smart TV experience.
K400 Plus for Home Theater PC (HTPC)
The Logitech K400 Plus is a superb companion for your Home Theater PC (HTPC), transforming your living room into a multimedia hub. Its wireless freedom and all-in-one design eliminate cable clutter, providing a clean and streamlined setup. The integrated trackpad offers precise cursor control for navigating media libraries and applications on your big screen.
Dedicated media keys allow for effortless playback control, volume adjustment, and quick access to frequently used functions. The comfortable keyboard layout makes typing searches and managing your media collection a breeze.
Connecting is simple via the USB receiver or Bluetooth, ensuring a stable and reliable connection. Enjoy a more immersive and convenient HTPC experience with the K400 Plus.
K400 Plus in Sim Racing Setups
Interestingly, the Logitech K400 Plus is gaining traction within the sim racing community as a supplementary input device. While not a primary racing wheel or pedal set replacement, its compact size and integrated trackpad offer unique advantages. The trackpad can be mapped for pit lane adjustments, camera control, or quick access to telemetry data, freeing up hands from the wheel.
Its wireless nature reduces cable management complexities, contributing to a cleaner sim racing cockpit. The keyboard itself can be utilized for voice chat or entering text commands within racing simulations.
Though unconventional, the K400 Plus provides a cost-effective and versatile solution for enhancing the sim racing experience.
Maintenance and Care
Regular cleaning with a soft, dry cloth ensures optimal performance. Replace batteries as needed and store the K400 Plus in a safe, dry location.
Cleaning the Keyboard and Trackpad
To maintain your Logitech K400 Plus, regular cleaning is essential. Begin by disconnecting the keyboard from your device. For the keyboard, gently turn it upside down and tap to dislodge any loose debris. Use a can of compressed air to remove dust and particles from between the keys.
For stubborn dirt, lightly dampen a soft, lint-free cloth with water or a mild cleaning solution – avoid harsh chemicals! Wipe the keycaps gently. The trackpad should be cleaned similarly, using a slightly damp cloth to remove fingerprints and smudges. Ensure both the keyboard and trackpad are completely dry before reconnecting and resuming use. Avoid excessive moisture, as it can damage the internal components.
Replacing Batteries
The Logitech K400 Plus operates on batteries, and replacing them is straightforward. Locate the battery compartment on the keyboard’s underside. Gently slide the compartment cover open. Remove the old batteries, noting their correct polarity (+ and -). Insert new, fresh batteries – typically two AA batteries – ensuring they are aligned with the markings inside the compartment.
Always use alkaline or lithium batteries for optimal performance. Avoid mixing old and new batteries, or different battery types. Once the new batteries are in place, slide the compartment cover closed until it clicks securely. The keyboard should now power on automatically. Dispose of used batteries responsibly, following local regulations for battery recycling.
Storage Recommendations
When storing your Logitech K400 Plus for an extended period, proper care will ensure its longevity. Before storing, remove the batteries to prevent potential leakage and corrosion, which can damage the internal components. Clean the keyboard and trackpad with a soft, dry cloth to remove dust and debris.
Store the keyboard in a cool, dry place, away from direct sunlight and extreme temperatures. Avoid placing heavy objects on top of the keyboard, as this could damage the keys or trackpad. Consider using a protective bag or case to shield it from dust and accidental impacts during storage.
Avoiding Damage and Wear
To maximize the lifespan of your Logitech K400 Plus, avoid exposing it to liquids. Spills can cause significant internal damage. Refrain from dropping the keyboard, as this can compromise its structural integrity and functionality. Do not attempt to disassemble the keyboard yourself, as this will void the warranty and could lead to irreparable harm.
Regularly clean the keyboard with a soft, slightly damp cloth – avoid abrasive cleaners. Be gentle when using the trackpad to prevent excessive wear. Store the keyboard properly when not in use, protecting it from dust and physical impacts. Handle with care to preserve its performance.
Logitech K400 Plus vs. K400: Key Differences
The K400 Plus boasts an upgraded touchpad, enhanced media controls, and improved battery life compared to the original K400, offering a refined user experience.
Design and Ergonomics
The Logitech K400 Plus maintains a compact and sleek design, prioritizing user comfort during extended use. Its layout is streamlined, making it ideal for living room setups where space is often limited. The keyboard features a slightly curved profile and soft-touch keys, contributing to a more natural typing experience.
Compared to traditional keyboards, the K400 Plus’s integrated touchpad eliminates the need for a separate mouse, reducing clutter and simplifying navigation. The touchpad surface is generously sized and responsive, supporting multi-finger gestures for intuitive control.
The overall build quality feels solid and durable, ensuring longevity. While not explicitly designed for gaming, the keyboard’s ergonomic considerations make it suitable for casual use and media consumption. Its lightweight construction further enhances portability and ease of use.
Connectivity Options
The Logitech K400 Plus offers two primary methods for connecting to your devices: a 2.4 GHz wireless USB receiver and Bluetooth. The included USB receiver provides a reliable, plug-and-play connection with a range of up to 10 meters (33 feet), minimizing potential interference. Bluetooth connectivity allows for pairing with smart TVs, smartphones, and tablets that support Bluetooth input.
Switching between devices is straightforward using the dedicated “Easy-Switch” button, enabling seamless control across multiple screens. The keyboard can store up to three paired Bluetooth devices, simplifying device management.
The wireless range and stability are generally excellent, ensuring a consistent connection. The K400 Plus doesn’t support wired connectivity, relying solely on wireless options for convenience and flexibility. This makes it a versatile solution for various home entertainment setups.
Performance Enhancements
Compared to the original K400, the K400 Plus boasts several performance improvements, notably an extended wireless range and enhanced touchpad responsiveness. Logitech refined the touchpad’s surface for smoother navigation and more accurate cursor control. The keyboard’s layout remains largely unchanged, preserving the familiar user experience.
Users report a noticeable improvement in the keyboard’s overall reliability and connection stability. The extended range allows for greater freedom of movement, particularly useful in home theater environments. The K400 Plus also features optimized power management, contributing to longer battery life.
While not a gaming keyboard, the K400 Plus delivers adequate performance for everyday tasks, media consumption, and basic smart TV control. It’s a solid upgrade for those seeking a more refined and dependable wireless experience.
Price Comparison
The Logitech K400 Plus typically retails for around $27.99, making it a remarkably affordable option within the wireless keyboard and touchpad category. This price point positions it as a budget-friendly choice for users seeking a convenient all-in-one solution.
The original K400 is often found at slightly lower prices when available, though its features are less refined. Competitors offering similar functionality, such as keyboards with integrated touchpads from other brands, generally range from $35 to $60 or more.
Considering its features, reliability, and ease of use, the K400 Plus offers excellent value for money. Frequent sales and promotions can further reduce the price, making it an even more attractive purchase.