1. Introduction
The Logitech Wireless Touch K400 Plus is a versatile wireless keyboard designed for seamless control of your PC-to-TV entertainment. It features an integrated multi-touch touchpad, quiet keys, and a reliable 2.4 GHz wireless connection with a range of up to 33 feet (10 meters). This manual provides essential information for setting up, operating, and maintaining your K400 Plus keyboard.
2. Package Contents
- Logitech Wireless Touch K400 Plus Keyboard
- USB Unifying Receiver
- 2 AA Batteries (pre-installed)
- User Documentation
3. Setup
3.1. Battery Installation
Your K400 Plus keyboard comes with two AA batteries pre-installed. To activate them, remove the battery compartment cover located on the underside of the keyboard and pull out the yellow tab. Ensure the batteries are correctly oriented according to the polarity indicators (+/-).
Image: Side view of the Logitech K400 Plus keyboard, highlighting the battery compartment on the underside. The keyboard is slim and black.
3.2. Connecting the USB Unifying Receiver
The K400 Plus uses a small USB Unifying Receiver for wireless connectivity. This receiver is typically stored inside the battery compartment for safekeeping. Remove the receiver and plug it into an available USB port on your PC, smart TV, or other compatible device.
Image: The Logitech K400 Plus keyboard shown with its compact USB Unifying Receiver, ready for connection.
3.3. Powering On the Keyboard
Locate the On/Off switch on the top right edge of the keyboard. Slide the switch to the 'On' position (green indicator visible). The keyboard should automatically connect to your device via the USB receiver.
4. Operating Instructions
4.1. Typing and Navigation
The K400 Plus features a standard QWERTY keyboard layout for typing. The integrated 3.5-inch multi-touch touchpad on the right side allows for intuitive cursor control and gesture-based navigation.
Image: A close-up view of the multi-touch touchpad on the Logitech K400 Plus keyboard, showing the smooth surface and integrated click buttons.
4.2. Touchpad Gestures
- Single Finger Tap: Left-click.
- Two Finger Tap: Right-click.
- Two Finger Scroll: Scroll vertically or horizontally.
- Pinch to Zoom: Zoom in or out (supported on compatible applications).
4.3. Media Controls and Hotkeys
Dedicated media keys are located above the touchpad for quick access to volume control (mute, volume down, volume up) and playback functions. The keyboard also includes hotkeys for Windows and Android operating systems, enhancing your control over connected devices.
4.4. Secondary Left-Click Button
For enhanced comfort, a secondary left-click button is located on the top-left corner of the keyboard. This allows you to navigate the touchpad with your right hand and click with your left thumb simultaneously.
5. Key Features
- Integrated Touchpad: A 3.5-inch multi-touch touchpad eliminates the need for a separate mouse, offering unified control.
- Wireless Connectivity: Reliable 2.4 GHz wireless connection with a 33 ft (10 meter) range, ideal for controlling devices from a distance.
- Long Battery Life: Up to 18 months of battery life with two AA batteries, supported by an on/off switch and power-saving technology.
- Quiet and Comfortable Keys: Designed for a comfortable typing experience with quiet, low-profile keys.
- Durable and Spill-Resistant: Built to withstand minor spills and everyday use.
- Plug-and-Play Setup: Easy setup with the tiny USB Unifying receiver, requiring no additional software installation.
- Broad Compatibility: Works with Windows 7, Windows 8, Windows 10 and later, Android 7 or later, and Chrome OS.
Image: A person comfortably using the Logitech K400 Plus keyboard while relaxing on a couch, demonstrating its suitability for home entertainment control.
Image: A family on a couch using the Logitech K400 Plus keyboard to interact with a television, illustrating its use in a home media setup.
6. Specifications
| Brand | Logitech |
| Model Name | K400 Plus |
| Connectivity Technology | RF Wireless (2.4 GHz) |
| Wireless Range | Up to 33 ft (10 meters) |
| Integrated Touchpad | 3.5-inch Multi-Touch |
| Power Source | 2 AA Batteries |
| Battery Life | Up to 18 months |
| Operating System Compatibility | Windows 7, 8, 10+, Android 7+, Chrome OS |
| Material | Plastic |
| Color | Black |
| Package Dimensions | 14.45 x 6.06 x 1.34 inches |
7. Maintenance
7.1. Cleaning
To clean your keyboard, use a soft, lint-free cloth slightly dampened with water. Avoid using harsh chemicals or abrasive cleaners. For the touchpad, a dry microfiber cloth is recommended to maintain its smooth surface.
7.2. Battery Replacement
When the battery indicator light on the keyboard turns red, it's time to replace the batteries. Open the battery compartment, remove the old AA batteries, and insert new ones, ensuring correct polarity. Dispose of used batteries responsibly.
8. Troubleshooting
8.1. No Connection
- Ensure the keyboard is powered on (green indicator).
- Verify the USB Unifying Receiver is securely plugged into a working USB port on your device.
- Try plugging the receiver into a different USB port.
- Replace the batteries if they are low or depleted.
- Move the keyboard closer to the USB receiver to rule out range issues.
8.2. Erratic Cursor Movement
- Clean the touchpad surface with a dry microfiber cloth.
- Ensure there are no obstructions between the keyboard and the USB receiver.
- Check for interference from other wireless devices.
8.3. Keys Not Responding
- Check battery levels and replace if necessary.
- Ensure the keyboard is connected to the receiver.
- Restart your computer or device.
9. Warranty and Support
For warranty information and technical support, please refer to the official Logitech website or the documentation included with your product. You can also find FAQs and troubleshooting guides online.
