S104 Mechanical Keyboard

RK Royal Kludge S104 Mechanical Keyboard

The RK Royal Kludge S104 is a 100% layout mechanical keyboard with RGB backlighting, a built-in display, a clickable rotary control knob, and three connection methods. It supports wired USB-C, Bluetooth, and 2.4 GHz wireless operation, allowing the keyboard to connect to compatible computers and Bluetooth-enabled devices.

The RK S104 features mechanical switches, a full-size keyboard layout, function keys, navigation keys, and a numeric keypad. Its RGB backlighting supports adjustable brightness, animation speed, color selection, lighting effects, and personalized key lighting configurations.

The integrated display shows keyboard status information, including the selected connection mode, Windows or Mac layout, Num Lock, Caps Lock, and Windows key lock. It also includes a date and time interface with 12-hour and 24-hour display options.

A clickable rotary knob provides access to the keyboard settings menu. It can adjust volume, select connection modes, change RGB effects, configure display settings, and set the date and time.

Bluetooth mode supports up to three saved device connections. The keyboard can switch between these devices using the rotary knob or Fn key shortcuts. The 2.4 GHz wireless mode uses a dedicated USB receiver, which is normally paired with the keyboard at the factory.

The RK S104 also supports Windows and Mac operating system modes, multimedia shortcuts, custom backlighting, driver-supported GIF display images, and a factory reset function.

Product Overview and Features

Technical Specifications

General Specifications

Keyboard Dimensions

The RK S104 measures:

• Length: 422.4 mm
• Width: 137.5 mm
• Height: 42.8 mm
• Tolerance: ±2 mm

Connection Modes

Parts and Components

The RK S104 combines a mechanical keyboard layout with an integrated status display, rotary knob, mode controls, and RGB lighting.

Main Components

Mechanical Keys

The keyboard uses mechanical switches for key input.

The layout includes standard alphanumeric keys, function keys, navigation controls, and a numeric keypad.

Fn Key

The Fn key activates secondary keyboard functions, including:

• Bluetooth switching
• Wireless receiver pairing
• Wired mode selection
• RGB lighting adjustments
• Multimedia playback
• Windows and Mac mode switching
• Windows key locking
• Factory reset

RGB Backlighting

The keyboard has RGB backlighting with adjustable effects, colors, brightness, and animation speed.

Integrated Display

The keyboard includes a display positioned near the rotary control knob.

The display provides information about:

• Connection mode
• Operating system layout
• Time
• Num Lock
• Caps Lock
• Windows Lock
• RGB lighting settings

Rotary Control Knob

The knob controls volume by default.

It also allows menu navigation, selection, and confirmation.

USB Type-C Connector

The USB Type-C port provides a wired connection to a compatible computer.

ON/OFF Switch

The power switch is used when operating the keyboard wirelessly.

Set the switch to ON before using Bluetooth or 2.4 GHz mode.

2.4 GHz Receiver Storage Area

The keyboard includes a storage compartment for the 2.4 GHz wireless receiver.

Keyboard Indicator Lights

The RK S104 provides dedicated status indicators.

Num Lock

The Num Lock indicator shows whether the numeric keypad lock is active.

Caps Lock

The Caps Lock indicator shows whether uppercase typing mode is enabled.

Windows Lock

The Win Lock indicator shows whether the Windows key lock function is active.

Important Safety Instructions

Charging Safety

The RK S104 does not support fast charging.

The keyboard should not be charged using a fast-charging method.

Battery Safety

The battery must not be exposed to excessive heat, including direct sunlight, fire, or similar sources.

Avoid the following conditions:

• Replacing the battery with an incorrect type that defeats a safety safeguard.
• Placing the battery in fire or a hot oven.
• Mechanically crushing or cutting the battery.
• Leaving the battery in an extremely hot environment.
• Exposing the battery to extremely low air pressure.

These conditions may result in explosion or leakage of flammable liquid or gas.

Keyboard Handling Precautions

• Maintain correct posture during keyboard use.
• Avoid excessive force when pressing keys.
• Take regular breaks to reduce hand fatigue.
• Keep the keyboard clean and free from dust.
• Avoid exposing the keyboard to liquids.
• Keep the keyboard away from extreme temperatures and humidity.

Unauthorized Modifications

Changes or modifications not expressly approved by the responsible compliance party may affect authorization to operate the device.

Before First Use

Before operating the RK S104, select the required connection method.

The keyboard supports three connection types:

1. Wired USB-C
2. Bluetooth
3. 2.4 GHz wireless

For wired operation, connect the USB cable and activate USB mode.

For Bluetooth or 2.4 GHz operation, move the power switch to ON and select the corresponding connection mode.

Initial Setup

1. Place the keyboard on a stable surface.
2. Select the required connection method.
3. Connect the USB cable or prepare the wireless connection.
4. Complete pairing if required.
5. Select Windows or Mac mode.
6. Adjust the display and RGB settings if desired.

Connecting the RK S104 in Wired USB Mode

The keyboard supports a direct wired connection through its USB Type-C connector.

How to Connect in Wired Mode

1. Connect the USB cable to the keyboard’s Type-C port.
2. Connect the other end to the compatible computer.
3. Briefly press Fn + R.
4. The keyboard enters wired mode.

Wired Connection Shortcut

Selecting USB Mode Using the Rotary Knob

Wired mode can also be activated through the integrated display.

Procedure

1. Connect the USB cable between the keyboard and computer.
2. Press the rotary knob to open the settings menu.
3. Rotate the knob to select the USB Mode icon.
4. Press the knob to confirm.
5. The keyboard switches to USB mode.

Using the Rotary Knob

The RK S104 has a clickable rotary knob for volume control and display navigation.

Default Knob Functions

Adjusting Volume

Turn the knob clockwise to increase volume.

Turn it counterclockwise to decrease volume.

Opening the Settings Menu

1. Click the knob.
2. The settings menu appears.
3. Rotate the knob to choose the required option.
4. Press the knob briefly to confirm.

Setting the Date and Time

The keyboard display supports manual date and time configuration.

The time interface uses:

• Year
• Month
• Day
• Hour
• Minute
• Second

How to Set the RK S104 Clock

1. Open the main time interface on the keyboard display.
2. Press and hold the rotary knob for approximately five seconds.
3. Wait until the year begins flashing.
4. Rotate the knob clockwise to increase the selected value.
5. Rotate it counterclockwise to decrease the value.
6. Briefly press the knob to advance to the next date or time field.
7. Set the year, month, day, hour, minute, and second values.
8. After completing the settings, press and hold the knob for approximately five seconds to save and exit.

Quick Save Shortcut

Press Fn + T briefly to save the date and time settings and exit.

Time Settings Summary

Setting the Time Format

The keyboard display supports:

• 12-hour format
• 24-hour format

The time format can be selected through the display settings menu.

Bluetooth Connection

The RK S104 supports up to three saved Bluetooth devices.

Bluetooth devices can be paired and selected using the rotary knob or dedicated keyboard shortcuts.

The keyboard appears in the Bluetooth device list as:

RK S104

Connecting Through Bluetooth Using the Knob

Step 1: Enable Wireless Mode

Move the keyboard power switch to ON.

Step 2: Select a Bluetooth Device Slot

Press the knob to open the settings menu.

Rotate it to select one of the following Bluetooth icons:

• BT1
• BT2
• BT3

Step 3: Start Bluetooth Pairing

To pair the first device:

1. Select BT1.
2. Press and hold the knob.
3. The display shows BT1 Pairing.

The keyboard has entered Bluetooth pairing mode.

Step 4: Connect the Computer or Mobile Device

1. Enable Bluetooth on the computer, tablet, or phone.
2. Search for available Bluetooth devices.
3. Select RK S104.
4. Complete the connection.

After the connection is completed, the keyboard display automatically returns to the main interface.

Pairing Additional Bluetooth Devices

Repeat the same procedure using BT2 and BT3.

The keyboard can store three groups of Bluetooth device connections.

Switching Between Bluetooth Devices Using the Knob

After pairing, Bluetooth connections can be selected through the display.

Switching Procedure

1. Open the Bluetooth selection screen.
2. Rotate the knob to select BT1, BT2, or BT3.
3. Briefly press the knob.
4. The display shows the corresponding linking message, such as BT1 Linking.
5. The keyboard reconnects to the selected device.

The manual recommends pairing the three Bluetooth device slots before using the switching function.

Bluetooth Pairing With Fn Shortcuts

Bluetooth pairing can also be started directly through keyboard shortcuts.

Bluetooth Device Shortcuts

How to Pair Bluetooth Device 1

1. Move the power switch to ON.
2. Press and hold Fn + Q for three seconds.
3. The display shows BT1 Pairing.
4. Enable Bluetooth on the target device.
5. Search for RK S104.
6. Select the keyboard to complete pairing.

Pairing Bluetooth Device 2

1. Move the switch to ON.
2. Hold Fn + W for approximately three seconds.
3. Complete pairing through the target device’s Bluetooth settings.

Pairing Bluetooth Device 3

1. Move the switch to ON.
2. Hold Fn + E for approximately three seconds.
3. Complete pairing through the target device’s Bluetooth settings.

Switching Between Paired Bluetooth Devices

After pairing:

• Briefly press Fn + Q for BT1.
• Briefly press Fn + W for BT2.
• Briefly press Fn + E for BT3.

A long press activates pairing, while a short press selects a saved connection.

Bluetooth Display Messages

After a Bluetooth connection is completed, the display automatically returns to the main interface.

Connecting Using 2.4 GHz Wireless

The RK S104 uses a 2.4 GHz USB receiver for wireless operation.

The keyboard and receiver are paired at the factory.

How to Connect in 2.4 GHz Mode

1. Move the power switch to ON.
2. Press the rotary knob to open the settings menu.
3. Rotate the knob to the 2.4G icon.
4. Briefly press the knob to select the connection mode.
5. The display shows 2.4G Linking.
6. When the connection succeeds, the display shows 2.4G Success.
7. The screen automatically returns to the Home interface.

Pairing the 2.4 GHz Receiver Using the Knob

If receiver pairing is required:

1. Move the power switch to ON.
2. Rotate the knob to select the 2.4G icon.
3. Press and hold the knob.
4. Wait for the display to show 2.4G Pairing.
5. Insert the 2.4 GHz receiver into the computer.
6. Wait for the display to show 2.4G Success.

After pairing succeeds, the keyboard returns to the Home screen.

2.4 GHz Connection Using Fn + P

The keyboard also provides a dedicated 2.4 GHz shortcut.

Switching to 2.4 GHz Mode

1. Move the power switch to ON.
2. Briefly press Fn + P.
3. The display shows 2.4G Linking.
4. When the connection succeeds, the display shows 2.4G Success.

Pairing the 2.4 GHz Receiver

1. Press and hold Fn + P for approximately three seconds.
2. The display shows 2.4G Pairing.
3. Insert the 2.4 GHz receiver.
4. Wait for 2.4G Success.

The keyboard and receiver normally do not require re-pairing because they are paired at the factory.

2.4 GHz Shortcut Summary

Storing the 2.4 GHz Receiver

The RK S104 has a dedicated receiver storage area next to the power switch.

Keep the receiver in this compartment when it is not connected to a computer.

Understanding the Integrated Display

The RK S104 display provides keyboard status information and configuration menus.

Display Indicators

Display Settings Menu

The keyboard display includes the following settings.

Changing the Display Home Screen

The Home screen can be set to:

1. Time interface
2. Customizable GIF image

Custom GIF images require compatible driver support.

Changing the Display Language

The integrated display supports:

• English
• Chinese

Language Selection

1. Open the display settings menu.
2. Select Home/Layout/Language.
3. Open the language setting.
4. Select the required display language.

Changing Windows and Mac Layout Through the Display

The display settings include a layout selection option.

Layout Selection

1. Open the settings menu using the knob.
2. Select Home/Layout/Language.
3. Open Layout.
4. Choose Windows or Mac.

The operating system mode can also be changed through Fn shortcuts.

Using a Custom GIF on the Display

The RK S104 supports a customizable GIF image on its built-in display.

This function requires the compatible RK keyboard driver.

The driver download address is:

https://en.rkgaming.com/download/1

The Home screen settings provide the option to select a customizable GIF image when driver support is available.

Changing RGB Backlight Effects Using the Knob

The display menu provides controls for RGB backlighting.

Changing Lighting Effects

1. Press the rotary knob to open the settings menu.
2. Select Effect.
3. Press the knob.
4. Rotate the knob to choose a backlight effect.

Changing Backlight Color

1. Open the display menu.
2. Select Colour.
3. Press the knob.
4. Rotate the knob to choose a different color.

Adjusting Backlight Brightness

1. Open Backlight Brightness/Speed Settings.
2. Select Brightness.
3. Press the knob.
4. Rotate the knob to adjust brightness.

Adjusting Lighting Speed

1. Open Backlight Brightness/Speed Settings.
2. Select Speed.
3. Press the knob.
4. Rotate the knob to change the lighting animation speed.

RGB Backlight Keyboard Shortcuts

The RK S104 provides direct shortcuts for adjusting lighting without opening the display menu.

Increasing Backlight Brightness

Press Fn + Up Arrow.

Decreasing Backlight Brightness

Press Fn + Down Arrow.

Increasing Backlight Speed

Press Fn + Right Arrow.

Decreasing Backlight Speed

Press Fn + Left Arrow.

Changing RGB Color

Press Fn with the comma/less-than key.

Switching RGB Effects

Press Fn with the backslash/vertical-bar key.

Customizing the RGB Backlighting

The RK S104 supports custom key backlighting.

Users can select individual keys for a personalized lighting configuration.

How to Set Custom Backlighting

1. Press Fn + 1 to select the customizable backlight mode.
2. Press Fn + Backspace to enter backlight recording mode.
3. The keyboard backlight turns off to indicate that recording has started.
4. Press the keys that should be included in the custom configuration.
5. Repeat the selection process for additional keys.
6. Press Fn + Backspace again to save the settings and exit recording mode.

Custom Backlight Shortcuts

Windows and Mac Operating System Modes

The RK S104 supports Windows and Mac keyboard layouts.

The selected mode changes the available multimedia and function-key behavior.

Switching to Windows Mode

Press Fn + A.

Switching to Mac Mode

Press Fn + S.

Operating System Shortcuts

Windows Multimedia Keyboard Shortcuts

When the keyboard is set to Windows mode, Fn + F1 through Fn + F12 provide application and media controls.

Opening the Browser

Press Fn + F2.

Opening the Calculator

Press Fn + F4.

Controlling Multimedia Playback

Adjusting Audio Volume

Press Fn + F10 to mute sound.

Press Fn + F11 to decrease volume.

Press Fn + F12 to increase volume.

Mac Multimedia Keyboard Shortcuts

When the keyboard is set to Mac mode, the function keys provide Mac-specific controls.

Adjusting Screen Brightness on Mac

Press Fn + F1 to decrease screen brightness.

Press Fn + F2 to increase it.

Adjusting Keyboard Backlight Brightness on Mac

Press Fn + F5 to decrease backlight brightness.

Press Fn + F6 to increase backlight brightness.

Mac Playback Controls

Use Fn + F7, Fn + F8, and Fn + F9 for previous track, play/pause, and next track.

Additional Function Key Shortcuts

The RK S104 includes several secondary shortcuts.

Locking the Windows Key

The RK S104 includes a Windows key lock function.

How to Lock or Unlock the Windows Key

Press Fn + Win.

The Win Lock indicator shows the current lock state.

Restoring Factory Settings

The keyboard supports a factory reset shortcut.

How to Reset the RK S104

1. Press and hold Fn + Spacebar.
2. Keep both keys pressed for approximately three seconds.
3. Allow the keyboard to restore its factory settings.

Keyboard Driver and Software

The RK S104 includes driver-supported customization features.

The manual provides the following driver download address:

https://en.rkgaming.com/download/1

The driver supports the customizable GIF display feature.

Troubleshooting Guide

The following checks use the connection procedures, display messages, and keyboard functions described in the manual.

Common Problems and Connection Checks

Wired Connection Does Not Work as Expected

1. Connect the USB Type-C cable to the keyboard and computer.
2. Briefly press Fn + R to select wired mode.
3. Alternatively, open the display settings menu and select USB Mode.

Bluetooth Device Is Not Found

1. Move the power switch to ON.
2. Hold Fn + Q, Fn + W, or Fn + E for three seconds.
3. Check the Bluetooth pairing message on the display.
4. Enable Bluetooth on the target device.
5. Search for RK S104.
6. Select the keyboard to complete pairing.

Bluetooth Device Does Not Reconnect

Select the previously paired Bluetooth slot through the rotary knob.

Alternatively, briefly press Fn + Q, Fn + W, or Fn + E.

2.4 GHz Receiver Pairing Is Required

1. Set the power switch to ON.
2. Hold Fn + P for three seconds.
3. Wait for the display to show 2.4G Pairing.
4. Insert the wireless receiver.
5. Wait for 2.4G Success.

The receiver is normally paired at the factory.

Display Shows 2.4G Linking

The keyboard is attempting to establish the saved 2.4 GHz connection.

A successful connection is indicated by 2.4G Success.

Custom Backlight Settings Are Not Saved

After selecting the required keys in recording mode, press Fn + Backspace again.

This saves the configuration and exits recording mode.

Windows Multimedia Shortcuts Are Incorrect

Press Fn + A to select Windows mode.

Mac Multimedia Shortcuts Are Incorrect

Press Fn + S to select Mac mode.

Factory Settings Need Restoration

Hold Fn + Spacebar for three seconds.

Cleaning and Maintenance

Regular care helps maintain reliable keyboard operation.

General Keyboard Care

1. Keep the keyboard clean.
2. Remove accumulated dust and dirt regularly.
3. Avoid spilling liquids on the keys or housing.
4. Avoid excessive force when pressing keys.
5. Keep the keyboard away from extreme temperatures.
6. Avoid exposing the keyboard to high humidity.

Comfortable Keyboard Use

Maintain a suitable posture while typing.

Take regular breaks to reduce hand fatigue.

Storage and Battery Precautions

Keep the keyboard in an environment protected from:

• Extreme heat
• Extreme cold
• Excessive moisture
• Liquids
• Physical damage

Battery Storage Safety

Do not leave the battery in extremely hot surroundings or expose it to fire.

Do not subject the battery to extremely low air pressure.

Do not mechanically crush, cut, or disassemble the battery.

Regulatory and Compliance Information

FCC Compliance

The RK S104 complies with Part 15 of the FCC Rules.

Operation is subject to two conditions:

1. The device must not cause harmful interference.
2. The device must accept received interference, including interference that may cause undesired operation.

The keyboard has been tested against the limits for a Class B digital device.

Radio Interference Precautions

If the keyboard causes interference with radio or television reception, the manual recommends:

• Reorienting or relocating the receiving antenna.
• Increasing the separation between the keyboard and receiver.
• Connecting the equipment to an outlet on a different circuit.
• Consulting the dealer or an experienced radio/TV technician.

Radio Frequency Exposure

The equipment complies with applicable FCC radiation exposure requirements for an uncontrolled environment.

The transmitter must not be co-located or operated together with another antenna or transmitter.

Canadian ISED Compliance

The keyboard contains licence-exempt radio equipment subject to applicable Innovation, Science and Economic Development Canada requirements.

The device must not cause interference and must accept received interference, including interference that may result in undesired operation.

Customer Support Information

For product issues or questions, contact RK Royal Kludge through its product support channels.

Frequently Asked Questions

1. How do I connect the Royal Kludge RK S104 using Bluetooth?

Move the keyboard power switch to ON, then hold Fn + Q, Fn + W, or Fn + E for three seconds to enter Bluetooth pairing mode. Enable Bluetooth on the computer or other device, search for RK S104, and complete the connection.

2. How do I connect the RK S104 using the 2.4 GHz receiver?

Move the power switch to ON and briefly press Fn + P to select 2.4 GHz mode. The receiver is normally paired at the factory. If pairing is required, hold Fn + P for three seconds, connect the receiver, and wait for the display to show 2.4G Success.

3. How do I use the RK S104 in wired mode?

Connect a USB Type-C cable between the keyboard and computer, then briefly press Fn + R. Wired mode can also be selected by opening the settings menu with the rotary knob and choosing USB Mode.

4. How do I set the date and time on the RK S104 display?

Open the time interface and hold the rotary knob for approximately five seconds until the year flashes. Rotate the knob to change the selected value and press it to advance through the fields. Hold the knob again for five seconds to save, or briefly press Fn + T.

5. How do I switch between Bluetooth devices on the RK S104?

The keyboard supports three Bluetooth connections. After pairing each device, briefly press Fn + Q, Fn + W, or Fn + E to switch between BT1, BT2, and BT3. The paired device can also be selected using the rotary knob.

6. How do I change the RGB lighting on the RK S104?

Press Fn + Up or Down Arrow to adjust brightness, Fn + Left or Right Arrow to change animation speed, and Fn with the comma or backslash key to change colors and effects. Lighting can also be configured through the display menu.

7. How do I switch the RK S104 between Windows and Mac modes?

Press Fn + A to switch to Windows mode or Fn + S to switch to Mac mode. The keyboard changes its multimedia and function-key behavior according to the selected operating system.

8. How do I factory reset the Royal Kludge RK S104?

Press and hold Fn + Spacebar for approximately three seconds. The keyboard restores its factory settings.