RK68 Mechanical Keyboard

Royal Kludge RK68 Mechanical Keyboard

The Royal Kludge RK68 is a compact 68% mechanical keyboard with RGB backlighting and three connection modes: USB wired, Bluetooth, and 2.4GHz wireless. It features mechanical switches, dedicated arrow keys, navigation functions, and keyboard shortcuts for Windows and Mac systems.

The RK68 measures 310 × 101 × 38 mm and supports up to three Bluetooth device profiles. The keyboard uses Fn + Q, Fn + W, and Fn + E to pair with or switch between Bluetooth devices. For 2.4GHz wireless operation, it connects through a USB receiver that is paired at the factory.

The keyboard includes RGB lighting controls for brightness, color, lighting-effect speed, and backlight modes. It also provides secondary key functions for F1–F12, Print Screen, Insert, Pause, Scroll Lock, and multimedia controls.

The RK68 has a built-in rechargeable battery with indicator functions for low battery, charging, full charge, and remaining battery level. The battery level can be checked using the Fn + Enter combination while the keyboard is operating wirelessly.

These instructions cover the RK68 keyboard’s setup, USB connection, Bluetooth pairing, 2.4GHz wireless operation, battery indicators, RGB backlighting, Windows and Mac shortcuts, factory reset, and maintenance.

Technical Specifications

Parts and Components

The RK68 includes a compact mechanical key layout with dedicated arrow keys and secondary navigation functions.

Keyboard Component Guide

Keyboard Layout

The RK68 uses a 68% keyboard layout, providing a smaller arrangement than a full-size keyboard while retaining dedicated arrow keys.

Standard function keys and several navigation functions are available through Fn combinations.

Indicator Lights and Battery Status

The RK68 uses keyboard indicator lights to display the current lock and battery status.

Indicator Light Guide

Low-Battery Indicator

When the battery becomes low, the Fn key flashes red.

Charging Indicator

When the keyboard is charging, the Spacebar flashes red three times.

When fully charged, the Spacebar flashes green five times.

Battery Charging Instructions

The RK68 contains a rechargeable battery and uses a USB connection for charging.

Important: The RK68 does not support fast charging.

How to Charge the RK68

1. Locate the keyboard’s USB connector.
2. Connect the USB cable to the keyboard.
3. Connect the other end to a suitable USB power source.
4. Check the Spacebar indicator for the charging signal.
5. Allow charging to complete.

The Spacebar’s green flashing sequence indicates that the battery is fully charged.

How to Check the RK68 Battery Level

The RK68 allows the remaining battery level to be checked in Bluetooth and 2.4GHz modes.

Battery Level Check

1. Turn on the keyboard in Bluetooth or 2.4GHz mode.
2. Press and hold Fn + Enter.
3. Observe the number-row backlighting.
4. The illuminated number keys indicate the battery’s remaining charge.

Battery Level Indicator Guide

When all number keys from 1 through 0 illuminate simultaneously, the battery is fully charged.

RK68 Connection Modes

The RK68 supports wired and wireless connection methods.

Connection Mode Comparison

How to Connect the RK68 in Wired Mode

Wired mode allows the keyboard to connect directly to a computer through USB.

Wired Connection Instructions

1. Connect the USB cable to the keyboard.
2. Connect the other end to the host computer.
3. Move the keyboard’s power switch to OFF.
4. Use the keyboard through the wired connection.

The OFF switch position is used for wired operation.

How to Connect the RK68 Using Bluetooth

The RK68 supports three Bluetooth profiles, allowing it to store connections for three different devices.

Bluetooth Pairing Shortcuts

Bluetooth Pairing Instructions

1. Move the keyboard’s power switch to ON.
2. Select one of the Bluetooth profiles using Fn + Q, Fn + W, or Fn + E.
3. Press and hold the selected combination to enter pairing mode.
4. The corresponding letter key flashes rapidly, indicating that pairing is active.
5. Enable Bluetooth on the computer, tablet, or phone.
6. Search for available Bluetooth devices.
7. Select RK68.
8. Complete the Bluetooth connection.

For example, holding Fn + Q enters pairing mode for the first Bluetooth profile.

Bluetooth Indicator Behavior

The corresponding W or E key identifies the selected profile when those combinations are used.

Saving Three Bluetooth Devices

The RK68 can store three groups of Bluetooth devices.

To save additional devices:

1. Select an unused Bluetooth profile.
2. Press and hold the corresponding Fn combination.
3. Pair the new device through its Bluetooth settings.
4. Repeat for the remaining profile if required.

Switching Between Bluetooth Devices

After devices have been paired, briefly press the corresponding shortcut.

A brief press switches profiles, while a long press enters pairing mode.

How to Connect the RK68 Using 2.4GHz Wireless

The 2.4GHz wireless mode uses a USB receiver.

The receiver is paired with the keyboard at the factory.

Switching to 2.4GHz Mode

1. Move the power switch to ON.
2. Briefly press Fn + P.
3. The keyboard switches to 2.4GHz wireless mode.
4. Use the paired USB receiver to connect to the computer.

How to Pair the 2.4GHz Receiver

If the receiver needs to be paired again:

1. Move the power switch to ON.
2. Press Fn + P briefly to select 2.4GHz mode.
3. Press and hold Fn + P to enter pairing mode.
4. Insert the USB receiver into the computer.
5. The P key flashes rapidly during pairing.
6. Pairing is complete when the P key stops flashing.

Note: The factory-paired receiver normally does not require another pairing operation.

RGB Backlight Settings

The RK68 features RGB backlighting with controls for brightness, effect speed, color, and lighting mode.

RGB Backlight Shortcut Table

Adjusting Backlight Brightness

The keyboard brightness is controlled using Fn and the vertical arrow keys.

• Press Fn + Up Arrow to increase brightness.
• Press Fn + Down Arrow to decrease brightness.

Adjusting Backlight Effect Speed

Use the horizontal arrow keys to change the speed of the active RGB lighting effect.

• Press Fn + Left Arrow to decrease the effect speed.
• Press Fn + Right Arrow to increase the effect speed.

Changing the RGB Backlight Color

Press Fn + Comma/Less-Than (<) to switch the backlight color.

Changing the RGB Backlight Mode

Press Fn + Backslash (\) to change the active lighting mode.

Secondary Function Keys

The keyboard includes secondary functions for navigation and system controls.

Secondary Key Combination Table

Print Screen

Press Fn + Home to activate the Print Screen function.

Insert

Press Fn + Delete to activate Insert.

Pause

Press Fn + Page Up to activate Pause.

Scroll Lock

Press Fn + Page Down to activate Scroll Lock.

End

Press Fn + Right Bracket (]) to perform the End function.

Windows and Mac Operating System Modes

The RK68 supports two keyboard system layouts.

System Mode Shortcuts

Switching to Windows Mode

Press Fn + A to select the Windows keyboard layout.

Switching to Mac Mode

Press Fn + S to select the Mac keyboard layout.

The multimedia functions available through the function keys differ between the two modes.

Standard F1–F12 Function Keys

The RK68 provides F1–F12 functions through Fn and the number row.

Function Key Table

Primary and Secondary Function Switching

The RK68 includes a shortcut for changing the primary and secondary functions of combination keys.

Press Fn + Left Ctrl to switch the key-function arrangement.

When the F1–F12 keys are in secondary function mode, the corresponding Fn combinations can be used for the multimedia functions listed below.

Windows Multimedia Shortcuts

In Windows mode, the RK68 provides application and multimedia controls.

Windows Multimedia Function Table

Windows Application Shortcuts

The first five multimedia shortcuts provide access to common applications.

Windows Music Playback Controls

Windows Volume Controls

Mac Multimedia Shortcuts

After selecting Mac mode, the function keys provide controls for screen brightness, multi-screen display, search, keyboard backlighting, and multimedia playback.

Mac Multimedia Function Table

Mac Screen Brightness Controls

• Fn + F1: Decrease screen brightness.
• Fn + F2: Increase screen brightness.

Multi-Screen Display and Search

• Fn + F3: Multi-Screen Display.
• Fn + F4: Search.

Mac Keyboard Backlight Controls

• Fn + F5: Decrease keyboard backlight brightness.
• Fn + F6: Increase keyboard backlight brightness.

Windows Key Lock Function

The RK68 includes a Windows key lock function.

How to Lock the Windows Key

Press Fn + Win.

The keyboard includes a Win Lock indicator that identifies the Windows lock status.

How to Reset the Royal Kludge RK68

The RK68 supports restoring factory settings through a keyboard shortcut.

Factory Reset Instructions

1. Locate the Fn key.
2. Press and hold Fn + Spacebar.
3. Keep both keys pressed for three seconds.
4. The keyboard restores its factory settings.

Connection and Indicator Troubleshooting

The keyboard includes pairing controls and indicator signals that can help identify connection and battery conditions.

Connection and Indicator Guide

Bluetooth Pairing and Reconnection

A long press on Fn + Q, W, or E starts Bluetooth pairing for the selected profile.

A short press switches to an already saved Bluetooth profile.

2.4GHz Receiver Pairing

The receiver is factory-paired with the keyboard.

If pairing is required again, hold Fn + P and insert the USB receiver. Successful pairing is indicated when the P key stops flashing.

Safety Instructions

The keyboard includes a rechargeable battery and wireless radio equipment that must be handled carefully.

Battery Safety

• Do not expose the battery to excessive heat, direct sunlight, or fire.
• Do not replace the battery with an incorrect type.
• Do not dispose of the battery in fire or a hot oven.
• Do not crush or cut the battery.
• Do not expose the battery to extremely high temperatures.
• Do not expose the battery to extremely low air pressure.

Incorrect battery handling may cause an explosion or the leakage of flammable liquid or gas.

General Usage Precautions

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

Cleaning and Maintenance

The keyboard should be cleaned regularly to remove dust and dirt.

Keyboard Maintenance Instructions

1. Keep the keyboard free from accumulated dust.
2. Avoid exposing the keyboard to liquids.
3. Use the keys without excessive force.
4. Maintain a suitable environment for keyboard operation.

Comfortable Keyboard Use

Maintain a suitable typing posture and avoid unnecessary pressure on the mechanical keys.

Take regular breaks during extended keyboard use.

Storage Instructions

The keyboard should be kept in a suitable environment, away from excessive temperature, humidity, and liquids.

Avoid conditions that may damage its electronic components or rechargeable battery.

Regulatory Information

FCC Compliance

The keyboard 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.

Reducing Radio Interference

If the equipment causes interference to radio or television reception, the following actions may help:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment to an outlet on a different electrical circuit.
• Consult the dealer or an experienced radio/TV technician.

ISED Compliance

The wireless equipment complies with the applicable licence-exempt radio requirements of Innovation, Science and Economic Development Canada.

The device must not cause prohibited interference and must accept interference that may affect its operation.

Changes or modifications not approved by the responsible party may void the user’s authority to operate the equipment.

Royal Kludge RK68 Driver Download

Royal Kludge provides a driver download resource for the keyboard.

Official Driver Download Address

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

The keyboard’s support software can be obtained through the manufacturer’s driver download page.

Customer Support Information

Royal Kludge provides assistance for product issues and questions.

The manufacturer advises customers to contact its support team when assistance is needed.

Frequently Asked Questions

1. How do I connect the Royal Kludge RK68 using Bluetooth?

Move the power switch to ON. Press and hold Fn + Q, Fn + W, or Fn + E to enter the selected Bluetooth pairing profile. Enable Bluetooth on the host device, search for RK68, and complete pairing.

2. How do I connect the RK68 using the 2.4GHz USB receiver?

Move the power switch to ON and briefly press Fn + P to select 2.4GHz mode. The factory-paired receiver can be used for the wireless connection. If pairing is required again, hold Fn + P and insert the receiver. Pairing succeeds when the P key stops flashing.

3. How do I check the battery level on the RK68?

While using Bluetooth or 2.4GHz mode, press and hold Fn + Enter. The number-row backlighting indicates the remaining battery charge in 10% increments. When keys 1 through 0 illuminate simultaneously, the battery is fully charged.

4. What does the flashing red Fn key mean?

A flashing red Fn key indicates that the battery is low. When the keyboard is charging, the Spacebar flashes red three times. When fully charged, the Spacebar flashes green five times.

5. How do I change the RK68 RGB backlight color and mode?

Press Fn + Comma/Less-Than to switch backlight color or Fn + Backslash to switch lighting mode. Use Fn + Up/Down Arrow for brightness and Fn + Left/Right Arrow for effect speed.

6. How do I switch between three Bluetooth devices on the RK68?

After pairing devices with the three Bluetooth profiles, briefly press Fn + Q, Fn + W, or Fn + E to switch between them.

7. How do I switch the RK68 between Windows and Mac modes?

Press Fn + A for Windows mode or Fn + S for Mac mode. The keyboard provides different multimedia functions according to the selected system layout.

8. How do I reset the Royal Kludge RK68 keyboard to factory settings?

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