1. Product Overview
The Rii K18Plus/K18S is a versatile multimedia wireless keyboard featuring a large multi-touch touchpad and 2-LED color backlighting. It supports both 2.4GHz wireless and Bluetooth connectivity, making it compatible with a wide range of devices including Android TV Boxes, PCs, Smart TVs, Xbox, Raspberry Pi, Tablets, HTPC, IPTV, Windows, and macOS systems.
Figure 1: Rii K18Plus/K18S Wireless Keyboard
Package Contents:
Figure 2: Package Contents
- 1 x Rii K18Plus/K18S Multimedia Wireless Keyboard
- 1 x 2.4G USB Receiver Adapter
- 1 x Micro USB Charging Cable
- 1 x User Manual
2. Setup Instructions
2.1 Unboxing and Initial Inspection
Carefully remove all items from the packaging. Inspect the keyboard and accessories for any signs of damage.
Video 1: Product Unboxing and Initial Setup
2.2 Locating the USB Receiver
The 2.4G USB receiver is conveniently stored in a compartment on the back of the keyboard. Gently slide open the cover to access it.
Figure 3: USB Receiver Location
2.3 Connecting to Your Device (2.4GHz Wireless Mode)
- Remove the 2.4G USB receiver from the back of the keyboard.
- Plug the USB receiver into an available USB port on your computer, Smart TV, Android TV Box, or other compatible device.
- Turn on the keyboard using the ON/OFF switch located on the top edge.
- The keyboard should automatically connect to the receiver.
Figure 4: 2.4GHz Wireless Connection Diagram
2.4 Connecting to Your Device (Bluetooth Mode)
For Bluetooth mode, ensure your device has Bluetooth capabilities. The keyboard features a button to switch between Bluetooth and 2.4GHz wireless modes.
- Turn on the keyboard using the ON/OFF switch.
- Press the mode switch button (usually indicated by a Bluetooth icon or 'Mode' text) to switch to Bluetooth mode.
- On your device, search for new Bluetooth devices and select the Rii K18Plus/K18S keyboard to pair.
2.5 Charging the Keyboard
The keyboard has a built-in rechargeable battery. Use the provided Micro USB charging cable to charge it. Connect one end to the keyboard's charging port and the other end to a USB charger, computer, or other USB power source.
Figure 5: Charging Connection
3. Operating Instructions
3.1 Keyboard Layout and Multimedia Keys
The keyboard features 83 keys and a touchpad. It includes dedicated multimedia keys for quick access to functions like volume control, play/pause, and more.
Figure 6: Multimedia Quick Start Guide
Multimedia Quick Start:
- Fn + ESC: Switch auto sleep mode
- Fn + F1: Pairing
- Fn + F2: Mute
- Fn + F3: Volume -
- Fn + F4: Volume +
- Fn + F5: Activate/Deactivate cursor
- Fn + F6: Home
- Fn + F7: Search
- Fn + F8: Menu
- Fn + F9: Email
- Fn + F10: Calculator
3.2 Touchpad Operation
The large multi-touch touchpad allows for intuitive navigation and control.
Figure 7: Touchpad Gestures
- Single finger click: Left Mouse button
- Two fingers click: Right Mouse button
- Two fingers slide: Scroll (vertical and horizontal)
- Two fingers pinch/spread: Zoom in/out
3.3 Backlight Control
The keyboard features 2-LED color backlighting (Green and Blue) for use in dim environments.
Figure 8: Backlight Color Options
To change the backlight color, press the Bulb button (usually located at the bottom right side of the keyboard). Pressing it cycles through Green, Blue, and Off.
4. Maintenance
4.1 Battery Life and Charging
The built-in rechargeable battery typically lasts about 2 weeks on a single charge. A red indicator light will be visible during charging and will turn off when fully charged (approximately 3 hours). If the blue indicator (the fourth one) keeps blinking, it indicates low battery and requires charging.
4.2 Cleaning
Use a soft, dry cloth to clean the keyboard surface. For stubborn dirt, a slightly damp cloth can be used, ensuring no moisture enters the device.
5. Troubleshooting
5.1 Connection Issues (Repair Method)
If the indicator LED always flashes, or the keyboard loses connection with the USB receiver, you may need to re-pair the device:
- Press the ESC button and turn on the keyboard simultaneously.
- Insert the USB dongle into your main device's USB port.
- The white LED on the keyboard will flash for 3-5 seconds, then turn off, indicating successful re-pairing.
5.2 Touchpad Not Responding
If the keyboard works but the touchpad does not respond, press Fn + F5 to activate/deactivate the cursor.
5.3 Signal Interference / Short Connection Distance
If you experience issues like repeated character input (e.g., 'a' appears as 'aaaaaa') or a very short connection distance, the signal might be interfered with. Use the provided USB extension cable to connect your device and the USB receiver, which can help improve signal strength and reduce interference.
5.4 Input Lag / Stuttering (Gaming)
Some users have reported input lag or keys getting stuck, particularly during gaming. This keyboard is generally not recommended for gaming due to potential input latency in certain scenarios.
6. Specifications
Figure 9: Keyboard Dimensions
| Feature | Description |
|---|---|
| Brand Name | Rii |
| Model | K18+ (RT518) |
| Type | 2.4Ghz Wireless (and Bluetooth for K18S/RT518S) |
| Interface Type | USB |
| Operation Style | Capacitive |
| Keyboard Standard | Mini Keyboard |
| Full Size keyboard | No |
| Wrist Support | No |
| Application | Desktop, Laptop, Tablet, Android TV Box, Smart TV, Xbox, Raspberry Pi, HTPC, IPTV |
| Language | French, Hebrew, English (layout varies by model) |
| Battery Included | Yes (Rechargeable) |
| Dimensions (L x W x H) | 317.2mm x 123.6mm x 18.3mm (approx. 12.48 x 4.86 x 0.72 inches) |
| Weight | 0.48 kg |
| Certification | CE, FCC, RoHS |
7. Warranty and Support
Riitek provides a one-year warranty for products purchased from them. They also offer life-long technology support.
- If the product is damaged upon receipt, please contact your local express company for compensation and then contact Riitek for problem resolution.
- If the product is not working properly within 15 days without improper use or damage, contact after-sales service for assistance.
- For issues within one year, contact for technology support or send back for repair.
8. User Tips
- Fire TV Compatibility: When using the wireless keyboard with Fire TV, an OTG cable is required.
- Samsung Smart TV: Newer Samsung Smart TVs may not support all functions of standard keyboards and mice.
- Touchpad Sensitivity: The touchpad sensitivity might differ from a laptop's built-in touchpad. Adjusting device settings may improve performance.
- Physical Mouse Buttons: Some users prefer physical left and right mouse buttons, which this model lacks on the touchpad itself, relying on gestures.
- Caps Lock Indicator: If the Caps Lock sensor blinks spontaneously, it might indicate a contact issue or interference. Try the repair method or use the extension cable.
- Scrolling Function: The scrolling function on the touchpad may not work ideally for all users.