1. Introduction
The Logitech K400 Plus is a full-size wireless keyboard with an integrated touchpad, designed for comfortable control of your TV-connected computer. It offers a seamless experience for browsing the web, watching videos, and interacting with your PC from the comfort of your couch.
Image: Logitech K400 Plus Wireless Touch Keyboard, showcasing its compact design and integrated touchpad.
Key Features
- Built-in touchpad for combined keyboard and mouse functionality.
- Long battery life, up to 18 months, with an on/off switch to conserve power.
- Logitech Unifying Connection Technology for reliable wireless connectivity.
- Compact and lightweight design for comfortable use.
- Wireless convenience with a range of up to 10 meters (33 feet).
Image: Visual representation of the K400 Plus's major functions, including the built-in touchpad and long battery life.
2. Setup
2.1. Initial Installation
The Logitech K400 Plus is designed for simple plug-and-play setup. Follow these steps to get started:
- Ensure the keyboard is powered on using the switch located on the device.
- Plug the mini Unifying USB receiver into an available USB port on your computer or TV-connected device.
- Your operating system should automatically detect and install the necessary drivers.
- For advanced customization and software downloads, visit the official Logitech support page for the K400 Plus.
Image: A hand plugging the Logitech Unifying receiver into a laptop's USB port, demonstrating the plug-and-play setup.
Image: Visual guide for easy installation, showing the keyboard power switch, USB receiver, and the Logitech support website.
3. Operating Instructions
3.1. Basic Keyboard and Touchpad Use
The K400 Plus functions like a standard keyboard for typing and an integrated touchpad for cursor control. The touchpad supports multi-touch gestures for enhanced navigation.
3.2. Touchpad Gestures
The 3.5-inch multi-touch touchpad supports the following gestures:
- Left Click: Single finger tap or press the dedicated left button.
- Right Click: Double finger tap or press the dedicated right button.
- Move Cursor: Slide one finger across the touchpad in any direction.
- Zoom: Use two fingers to pinch in or pull apart.
- Scroll: Swipe two fingers up/down for vertical scrolling, or left/right for horizontal scrolling.
- Disable Click Gestures: Press the FN key + Left click button simultaneously.
Image: Visual guide to touchpad gestures including single-finger tap for left click, two-finger tap for right click, and multi-finger gestures for movement, zoom, and scroll.
3.3. Function Keys and Hotkeys
The K400 Plus features dedicated hotkeys and customizable function keys for quick access to media controls and system functions.
- Hotkeys: Dedicated buttons for Left Mouse Button, Mute, Volume Down, and Volume Up.
- Function Keys (F1-F12):
- F1: Return
- F2: Homepage
- F3: Switch Application
- F4: Menu
- F5: Search
- F6: Show/Hide Desktop
- F7: Maximize Window
- F8: Switching Screens
- F9: Multimedia Key
- F10: Previous Track
- F11: Play/Pause
- F12: Next Track
- FN Key Combinations:
- FN + Ins: PC Sleep
- FN + Backspace: Print Screen
- FN + Caps Lock: Scroll Lock
- FN + Left Arrow: Home
- FN + Right Arrow: End
- FN + Up Arrow: Page Up
- FN + Down Arrow: Page Down
Image: Layout of the K400 Plus keyboard, highlighting the dedicated hotkeys for media control and the F-keys with their assigned functions.
3.4. Logitech Options Software
For advanced customization of your K400 Plus, download and install the Logitech Options software from the official Logitech support website. This software allows you to:
- Set Pointer Speed: Adjust the DPI value of the touchpad.
- Adjust Scrolling: Configure scroll direction (traditional or content tracks fingers), enable/disable smooth scrolling, and customize vertical/horizontal scrolling behavior.
- Customize Function Keys: Assign new functions to F1-F9 and Insert keys.
- Disable Keys: Turn off specific keys like Caps Lock, Scroll Lock, Insert, or the Windows logo key.
- Manage Backups: Automatically back up your device settings to the cloud and restore them on other computers.
Note: The FN key behavior on macOS or iOS may differ from standard Apple keyboards due to system compatibility.
4. Maintenance
4.1. Battery Replacement
The K400 Plus uses two AA alkaline batteries, providing approximately 18 months of battery life under typical usage. To replace the batteries:
- Locate the battery compartment on the underside of the keyboard.
- Open the compartment cover.
- Remove the old batteries and insert two new AA alkaline batteries, ensuring correct polarity.
- Close the battery compartment cover securely.
Always use the on/off switch to power down the keyboard when not in use to extend battery life.
Image: Detail of the K400 Plus keyboard, emphasizing its long battery life of up to 18 months.
4.2. Cleaning
To clean your keyboard, gently wipe the surfaces with a soft, damp cloth. Avoid using harsh chemicals or abrasive materials that could damage the finish or internal components.
5. Troubleshooting
5.1. Reinstalling Device Drivers
If you experience issues with your keyboard's functionality, reinstalling the device drivers can often resolve the problem:
- Preparation: Unplug the Unifying receiver from the USB port. If using Bluetooth (though K400 Plus primarily uses Unifying), turn the keyboard off and on again.
- Identify in Device Manager: Open Device Manager (right-click Start button > select Device Manager). Expand "Mice and other pointing devices" and "Keyboards" sections. Look for "HID-compliant mouse" and "HID Keyboard device".
- Uninstall Driver: Right-click the identified device and select "Uninstall device". If this option is grayed out, go to the General tab and click "Change Settings" to proceed.
- Restart and Reconnect: Restart your computer. After restarting, plug the Unifying receiver back into a USB port. The system should automatically reinstall the drivers.
- Verification: Open the properties of the HID-compliant mouse/keyboard in Device Manager and check the "Events" tab. Look for entries indicating "Device removed," "Device configured," and "Device started" with recent timestamps.
6. Specifications
| Feature | Detail |
|---|---|
| Brand | Logitech |
| Model | K400 Plus |
| Keyboard Standard | 87 Keys (Compact, no Numpad) |
| Operation Style | Membrane |
| Language | English |
| Application | Desktop, Laptop, Tablet (TV-connected) |
| Connectivity Type | 2.4GHz Wireless (Logitech Unifying USB Receiver) |
| Wireless Range | Up to 10 meters (33 feet) |
| Backlight Type | No backlight |
| Wrist Support | No |
| Battery Included | Yes (2 x AA alkaline batteries) |
| Battery Life | Up to 18 months (typical usage) |
| Touchpad | 3.5-inch multi-touch touchpad |
| Materials | 60% post-consumer recycled plastic |
| OS Support | Windows 7/8/10/11, Android 5.0+, ChromeOS, Linux |
Dimensions & Weight
| Component | Length | Width | Height | Weight |
|---|---|---|---|---|
| Keyboard | 354.3 mm | 139.9 mm | 23.5 mm | 390 g (incl. battery) |
| Touchpad | 47 mm | 76 mm | N/A | N/A |
| Receiver | 18.7 mm | 14.4 mm | 6.1 mm | 1.8 g |
Image: Detailed diagram illustrating the physical dimensions of the K400 Plus keyboard, its touchpad, and the Unifying receiver.
7. Warranty and Support
7.1. Warranty Information
The Logitech K400 Plus Wireless Keyboard comes with a 1-Year Limited Hardware Warranty. Please retain your proof of purchase for warranty claims.
7.2. Customer Support
For further assistance, technical support, or to download the latest software and drivers, please visit the official Logitech support website:
Logitech K400 Plus Support Page
A detailed user manual in PDF format is also available for download from the Logitech support site.
8. User Tips
- Software Installation: For full customization of keys and touchpad gestures, ensure you download and install the Logitech Options software from the official Logitech website.
- Battery Conservation: Always use the on/off switch on the keyboard to power it down when not in use. This significantly extends battery life.
- Serial Number Consistency: It is normal for serial numbers (S/N) on Logitech products to differ from those on the packaging. This is due to separate management and tracing processes for products and packaging.