Introduction
The Logitech K400 Plus Wireless Touch Keyboard is designed for comfortable control of your PC-to-TV entertainment. This versatile keyboard combines a full-size keyboard with a large touchpad, eliminating the need for a separate mouse. It offers seamless navigation for watching videos, browsing the web, and chatting from the comfort of your couch.
Setup Instructions
- Insert Batteries: Locate the battery compartment on the underside of the keyboard. Insert two AA batteries, ensuring correct polarity. The keyboard is designed for an 18-month battery life, reducing the frequency of battery changes.
- Locate USB Receiver: The tiny USB receiver is typically stored within the battery compartment for safekeeping. Carefully remove it.
- Connect USB Receiver: Plug the USB receiver into an available USB port on your PC or TV. The keyboard is plug-and-play, requiring no complex installation.
- Power On: Turn on the keyboard using the power switch, usually located on the side or top edge.
- Optional Software: For a personalized experience, you can download and install the Logitech Options software to customize settings and functions.

This image shows the top-down view of the Logitech K400 Plus Wireless Touch Keyboard, highlighting its integrated touchpad and full QWERTY layout.
Operating Instructions
Keyboard Functions
- Typing: Use the standard QWERTY keyboard layout for text input.
- Function Keys (F1-F12): These keys often have secondary functions (e.g., media controls, home button, page up/down, print screen, scroll lock, pause) indicated by blue icons. To activate these secondary functions, hold down the 'Fn' key (usually located near the bottom left) and press the desired function key.
- Volume Controls: Dedicated buttons for mute, volume up, and volume down are located above the touchpad for easy access.
- Home Button: A dedicated home button is available for quick navigation.
- Mouse Menus: The 'Ctrl' key may have a secondary function to open mouse menus, useful for navigating without a traditional mouse.
Touchpad Functions
- Cursor Movement: Slide your finger across the touchpad to move the cursor on the screen.
- Left-Click: Press the left button below the touchpad or tap the touchpad surface once.
- Right-Click: Press the right button below the touchpad or tap the touchpad surface with two fingers.
- Scrolling: Use two fingers to scroll vertically or horizontally on the touchpad.
- Zoom: Pinch in or out with two fingers to zoom.

This image provides a closer look at the keyboard and touchpad, showing the key layout and the yellow accent line on the touchpad.

The keyboard is shown resting on a couch next to a blanket, illustrating its intended use for home entertainment.

A family is depicted using the Logitech K400 Plus keyboard to control a TV, demonstrating its convenience for shared media experiences.
Key Features
- Integrated Touchpad: A large, responsive 3.5-inch touchpad for precise cursor control, eliminating the need for a separate mouse.
- Wireless Connectivity: Connects via a tiny USB-A receiver, offering a reliable wireless range for comfortable use from a distance.
- Media-Friendly Layout: Features dedicated media hotkeys and customizable function keys for easy control of entertainment.
- Long Battery Life: Enjoy up to 18 months of battery life with two AA batteries, minimizing interruptions.
- Spill-Resistant Design: Built to withstand accidental spills, providing durability for everyday use.
- Compact and Lightweight: Designed for portability and comfortable lap use.
Maintenance
- Cleaning: To clean the keyboard, use a soft, damp cloth. Avoid harsh chemicals or abrasive materials.
- Spill Management: The keyboard features a spill-resistant design. In case of accidental spills, quickly rinse the keyboard with water and allow it to dry completely before reuse.
- Battery Replacement: Replace the two AA batteries when the low battery indicator light appears or when performance degrades.
Troubleshooting
- No Response: Ensure the keyboard is powered on and the USB receiver is securely plugged into a working USB port. Check battery levels and replace if necessary.
- Intermittent Connection: Move the keyboard closer to the USB receiver to ensure it is within the wireless range. Avoid placing the receiver near metal objects or other sources of interference.
- Touchpad Not Working: Ensure the touchpad is not disabled (if applicable via software settings). Restart your computer or TV.
- Keys Not Responding: Clean around the affected keys to remove any debris. If the issue persists, try reinstalling the Logitech Options software.
Specifications
| Feature | Detail |
|---|---|
| Brand | Logitech |
| Model Number | 920-007137 |
| Item Weight | 1.02 pounds |
| Product Dimensions (LxWxH) | 13.78 x 5.51 x 0.79 inches |
| Color | Black |
| Power Source | Battery Powered |
| Batteries Required | 2 AA batteries |
| Connectivity Technology | USB-A |
| Special Feature | Integrated Touchpad |
Warranty and Support
For warranty information and technical support, please refer to the documentation included with your product or visit the official Logitech support website. Keep your purchase receipt for warranty claims.