1. Introduction
Thank you for choosing the RK ROYAL KLUDGE Sink87G TKL Mechanical Gaming Keyboard. This compact, tenkeyless (TKL) keyboard offers both wired and 2.4G wireless connectivity, dynamic RGB backlighting, and customizable features, providing a versatile and responsive typing and gaming experience. This manual provides detailed instructions for setup, operation, maintenance, and troubleshooting to ensure optimal performance of your keyboard.

Image: The RK ROYAL KLUDGE Sink87G TKL Mechanical Gaming Keyboard in white, showcasing its compact layout and vibrant RGB backlighting. A USB wireless dongle is visible to the right of the keyboard.
2. Package Contents
Please verify that all items are present in your package:
- RK ROYAL KLUDGE Sink87G TKL Mechanical Gaming Keyboard
- USB Cable (Type-C to Type-A)
- 2.4G Wireless USB Receiver
- Keycap Puller / Switch Puller (may be combined)
- User Manual (this document)
3. Product Overview
The Sink87G keyboard is designed for performance and convenience, featuring:
- Dual Connectivity: Seamlessly switch between wired USB-C and 2.4G wireless modes.
- TKL Layout: An 87-key compact design that saves desk space without sacrificing essential keys.
- Mechanical Switches: Equipped with balanced brown mechanical switches for a tactile typing experience with low noise.
- Dynamic RGB Backlighting: 16.8 million colors with 20 preset light effects and customizable options.
- Long Battery Life: Built-in 1850mAh battery providing extended wireless usage.
- Customizable Macros: Support for 3 on-board macros and software-based customization.

Image: A visual summary of the keyboard's main features, including its dual connectivity, brown mechanical switches, RGB lighting, macro customization, detachable USB-C cable, TKL layout, and 1850mAh battery capacity.

Image: This image highlights the balanced brown mechanical switches used in the keyboard, emphasizing their tactile feedback and low noise operation. Several keycaps are removed to show the switch mechanisms.
4. Setup
4.1. Charging the Keyboard
Before first use, it is recommended to fully charge the keyboard. Connect the supplied USB-C cable to the keyboard's USB-C port and the other end to a USB-A port on your computer or a 5V USB power adapter. The charging indicator light will show the charging status. A full charge typically takes 3-4 hours.

Image: This graphic illustrates the keyboard's battery features, including its 1850mAh capacity, fast charging capability (3-4 hours), and extended wireless usage time (up to 7 days).
4.2. Connecting the Keyboard
The RK ROYAL KLUDGE Sink87G supports two connection modes:
4.2.1. 2.4G Wireless Mode
- Locate the mode switch on the bottom of the keyboard and slide it to the 'Wireless' or '2.4G' position.
- Insert the 2.4G USB receiver into an available USB-A port on your computer.
- The keyboard should automatically connect. If not, press Fn + P to enter pairing mode. The indicator light will flash, then become solid once connected.
4.2.2. Wired Mode
- Locate the mode switch on the bottom of the keyboard and slide it to the 'Wired' or 'USB' position.
- Connect the supplied USB-C cable to the keyboard's USB-C port and the USB-A end to your computer's USB-A port.
- The keyboard will be recognized as a standard USB keyboard and is ready for use.

Image: This visual guide demonstrates both the 2.4G wireless connection method using a USB dongle and the reliable wired connection via a USB-C cable.
5. Operating Instructions
5.1. Basic Keyboard Functions
The keyboard operates as a standard TKL layout. Function keys (F1-F12) often have secondary multimedia or system functions accessible by pressing the Fn key in combination with the desired function key.
- Fn + F1-F12: Multimedia controls (e.g., volume, play/pause, stop, next/previous track). Specific functions may vary.
- Fn + Win: Locks/unlocks the Windows key to prevent accidental presses during gaming.
5.2. RGB Backlighting Control
The Sink87G keyboard features extensive RGB lighting customization directly from the keyboard or via software.
- Fn + \|: Cycles through 20 different RGB lighting effects.
- Fn + ↑ / ↓: Adjusts backlight brightness (5 levels).
- Fn + ← / →: Adjusts lighting effect speed.
- Fn + Home: Switches between static single colors (if supported by the current effect).

Image: A detailed view of the keyboard's right side, demonstrating the vibrant and dynamic RGB illumination with various light effect modes.
5.3. Macro Customization
The keyboard supports on-board macro recording and advanced customization via dedicated software.
5.3.1. On-board Macro Recording (Refer to specific key combinations in your quick start guide for exact steps)
Typically, on-board macro recording involves:
- Entering macro recording mode (e.g., Fn + M1/M2/M3).
- Pressing the keys you wish to record.
- Exiting recording mode (e.g., pressing the macro key again or Fn + M1/M2/M3).
5.3.2. Software Customization
For advanced customization of lighting effects, key assignments, and macros, download the official RK ROYAL KLUDGE software. The software is compatible with Windows systems and requires the keyboard to be in wired mode during configuration.
Software download link: bit.ly/RK_Keyboard_SW_240104
Note: Please contact customer support for any software installation or usage questions.

Image: This image displays the user interface of the RK ROYAL KLUDGE customization software, which allows for detailed control over light effects, macro shortcuts, and other DIY settings for the keyboard.
6. Maintenance
Proper maintenance ensures the longevity and performance of your keyboard.
- Cleaning: Use a soft, lint-free cloth slightly dampened with water or a mild cleaning solution to wipe the keycaps and keyboard surface. Avoid excessive moisture. For deeper cleaning, use a keycap puller to remove keycaps and compressed air to clear debris from between switches.
- Storage: Store the keyboard in a cool, dry place away from direct sunlight and extreme temperatures.
- Avoid Spills: Liquids can severely damage the keyboard's internal components. In case of a spill, immediately disconnect the keyboard and allow it to dry completely before attempting to use it again.
7. Troubleshooting
If you encounter issues with your RK ROYAL KLUDGE Sink87G keyboard, please refer to the following common solutions:
| Problem | Possible Solution |
|---|---|
| Keyboard not responding in wireless mode. |
|
| Keyboard not responding in wired mode. |
|
| RGB lighting not working or stuck. |
|
| Keys are not registering or double-typing. |
|
If the problem persists after trying these solutions, please contact RK ROYAL KLUDGE customer support for further assistance.
8. Specifications
| Feature | Detail |
|---|---|
| Model Number | RK87/987/Sink87G |
| Connectivity | 2.4G Wireless, USB Wired (USB-C) |
| Keyboard Layout | Tenkeyless (TKL), 87-key |
| Switch Type | Mechanical (Brown Switches) |
| Backlighting | RGB (16.8 million colors, 20 effects) |
| Battery Capacity | 1850mAh Lithium Polymer |
| Charging Time | Approx. 3-4 hours |
| Wireless Usage Time | Up to 7 days (depending on usage and lighting) |
| Material | Acrylonitrile Butadiene Styrene |
| Product Dimensions | 13.78"L x 6.89"W x 1.97"H (approx. 35 x 17.5 x 5 cm) |
| Item Weight | 2.66 pounds (approx. 1.2 kg) |
| Compatible Devices | Gaming Console, PC (Windows, macOS - basic functions) |
9. Warranty and Support
9.1. Warranty Information
RK ROYAL KLUDGE products typically come with a limited warranty covering manufacturing defects. Please refer to the warranty card included with your product or visit the official RK ROYAL KLUDGE website for detailed warranty terms and conditions. Keep your proof of purchase for warranty claims.
9.2. Customer Support
For technical support, warranty claims, or any other inquiries, please contact RK ROYAL KLUDGE customer service through their official website or the contact information provided in your product packaging. When contacting support, please have your product model number (RK87/987/Sink87G) and purchase details ready.