Introduction
The REDRAGON CYRUS K681 PRO is a versatile 75% mechanical gaming keyboard designed for optimal performance and customization. It features tri-mode connectivity (2.4GHz wireless, Bluetooth 3.0+5.0, and USB wired), vibrant RGB backlighting, hot-swappable switches, and a gasket structure for a superior typing experience. This manual provides detailed instructions for setting up, operating, maintaining, and troubleshooting your K681 PRO keyboard.
Setup
Package Contents
Before you begin, please ensure all items are present in the package:
- REDRAGON CYRUS K681 PRO Mechanical Keyboard
- User Manual
- Data Cable (USB-C to USB-A)
- 2.4G Wireless Receiver
- Keycap/Switch Removal Tool
- Spare Switches (x4)
Connection Modes
The K681 PRO supports three connection modes: 2.4G Wireless, Bluetooth, and Wired USB. Use the switch on the left side of the keyboard to select your desired mode.
1. 2.4G Wireless Mode
- Switch the mode selector on the left side of the keyboard to '2.4G'.
- Plug the 2.4G USB receiver into an available USB port on your computer.
- The keyboard should automatically connect. If not, ensure the keyboard is powered on.
2. Bluetooth Mode (BT1 / BT2)
The keyboard supports connecting to two Bluetooth devices (BT1 and BT2) simultaneously, with easy switching.
- Switch the mode selector on the left side of the keyboard to 'BT'.
- To pair with BT1: Press and hold FN + Q for 3 seconds until the Q key flashes rapidly.
- To pair with BT2: Press and hold FN + W for 3 seconds until the W key flashes rapidly.
- On your device (PC, tablet, phone), search for Bluetooth devices and select 'REDRAGON K681 PRO'.
- Once paired, the corresponding key (Q or W) will stop flashing and remain steadily lit.
- To switch between paired Bluetooth devices, simply press FN + Q or FN + W.
3. Wired Mode
- Switch the mode selector on the left side of the keyboard to 'Data Cable' (or wired icon).
- Connect the USB-C end of the provided data cable to the keyboard and the USB-A end to your computer.
- The keyboard will function as a wired device and will also charge its internal battery.
Initial Charging
The keyboard is equipped with a 4000mAh built-in lithium battery. For optimal performance, it is recommended to fully charge the keyboard before its first wireless use. Connect the keyboard via the USB-C data cable to a powered USB port on your computer or a USB wall adapter.
Operating Instructions
Basic Key Functions
The K681 PRO features an 82-key layout. Standard alphanumeric and symbol keys function as expected.
FN Key Combinations
The Function (FN) key allows access to secondary functions printed on various keys. These functions may vary slightly between Windows and Mac systems.
Windows System FN Functions:
- FN + F1: Decrease screen brightness
- FN + F2: Increase screen brightness
- FN + F3: Display multi-task window
- FN + F4: Voice (Mute/Unmute)
- FN + F5: Display desktop
- FN + F6: Search
- FN + F7: Previous track
- FN + F8: Play/Pause
- FN + F9: Next track
- FN + F10: Mute
- FN + F11: Decrease volume
- FN + F12: Increase volume
- FN + <[{: Home
- FN + >]}: End
- FN + <;: Scroll Lock (ScrlLK)
- FN + "': Print Screen (PrtSC)
- FN + /?: Pause
Mac System FN Functions:
- FN + F1: F1
- FN + F2: F2
- FN + F3: F3
- FN + F4: F4
- FN + F5: F5
- FN + F6: F6
- FN + F7: F7
- FN + F8: F8
- FN + F9: F9
- FN + F10: F10
- FN + F11: F11
- FN + F12: F12
Backlight Control
The K681 PRO features 16.8 million color RGB backlighting with various customization options.
- FN + INS: Switch backlight mode (15 preset RGB modes).
- FN + ↑ (Up Arrow): Increase backlight brightness (5 levels).
- FN + ↓ (Down Arrow): Decrease backlight brightness (5 levels).
- FN + ← (Left Arrow): Decrease backlight speed.
- FN + → (Right Arrow): Increase backlight speed.
- FN + ENTER: Toggle backlight color (for static color modes).
Knob Function
The multi-functional knob located on the top right of the keyboard provides quick access to volume and backlight settings.
- Rotate Clockwise: Increases volume.
- Rotate Counter-clockwise: Decreases volume.
- Press Knob: Mutes/unmutes volume. Press again to restore original volume.
- Press and Hold Knob (3 seconds): Switches the knob function to backlight brightness adjustment.
- Rotate Clockwise (Backlight Mode): Increases backlight brightness.
- Rotate Counter-clockwise (Backlight Mode): Decreases backlight brightness.
- Press Knob (Backlight Mode): Cycles through different light effects.
- Press and Hold Knob (2 seconds, Backlight Mode): The keyboard light will flash twice, and the knob function will return to volume adjustment.
Macro Programming
The keyboard supports macro programming, allowing you to customize key assignments and lighting effects according to your needs. This typically requires dedicated software from the manufacturer. Please refer to the official Redragon website for the latest software and detailed instructions on macro programming.
Battery Level Display
The keyboard provides visual indicators for battery status:
- When the battery voltage is lower than 3.3V, the backlight will be disabled. If there are key actions, the battery indicator will flash slowly in red.
- When the battery voltage is equal to or lower than 3.0V, the keyboard function will be disabled.
- To display the battery level: Hold FN + ALT. The entire backlight will turn off. Keys [1] through [0] in the letter area will display the battery level. When the battery level is low, keys [1] through [3] will display red. For battery levels above [3], keys [1] through [0] will display green. Release FN + ALT to restore the default light effect.
Maintenance
Cleaning the Keyboard
- Disconnect the keyboard from your computer before cleaning.
- Use a soft, lint-free cloth slightly dampened with water or a mild cleaning solution to wipe the keycaps and keyboard surface.
- For stubborn dirt between keys, use compressed air to blow out debris.
- Avoid using harsh chemicals, abrasive cleaners, or excessive moisture, as these can damage the keyboard.
Hot-Swappable Switch Replacement
The K681 PRO features hot-swappable switches, allowing you to easily replace switches without soldering.
- Pull out the keycap: Use the provided keycap puller to gently remove the keycap from the switch you wish to replace.
- Unplug the switch: Use the switch puller tool to grasp the top and bottom clips of the switch. Gently pull the switch straight up and out of the PCB.
- Install a new switch: Align the pins of the new switch with the holes on the PCB. Ensure the pins are straight to avoid bending.
- Press in the switch: Gently press the new switch down until it clicks into place. Ensure it is seated firmly and evenly.
- Install the keycap: Place the keycap back onto the new switch.
The keyboard is compatible with most 3-pin/5-pin mechanical switches.
Troubleshooting
- Keyboard not responding in wireless mode: Ensure the keyboard is charged, the 2.4G receiver is properly plugged in, or Bluetooth is correctly paired. Check the mode switch on the keyboard.
- Bluetooth connection issues: Make sure the keyboard is in Bluetooth mode (BT1 or BT2) and in pairing mode (FN+Q/W flashing). Remove previous pairings on your device and try re-pairing. Ensure your device's Bluetooth is enabled.
- Backlight not working or dim: Check the backlight brightness settings using FN+↑ (Up Arrow) or the knob. If the battery is low (below 3.3V), the backlight will automatically turn off. Charge the keyboard.
- Keys not registering: If a specific key is not working, try replacing its switch using the hot-swappable feature. If multiple keys or the entire keyboard is unresponsive, try connecting via wired mode to rule out wireless issues.
- Unexpected behavior: Try resetting the keyboard (if a reset function is available, consult the manufacturer's website or support). Ensure the keyboard's firmware is up to date.
- Knob not adjusting volume/backlight: Ensure the knob is in the correct mode (volume or backlight). Press and hold the knob to switch between modes.
Specifications
| Feature | Detail |
|---|---|
| Model | K681RGB-PRO |
| Connection Type | 2.4G Wireless, Bluetooth (3.0+5.0), USB Wired |
| Switch Type | Mechanical (Hot-swappable Dragon Growl switches) |
| Keycaps | Dual injection moulded |
| Lighting | RGB (16.8 Million Colors, Multicolor) |
| Knob Control | Light/Volume |
| Battery Capacity | 4000mAh |
| Cable Length | 1500mm |
| Keyboard Standard | 82 Key |
| Operation Style | Mechanical |
| Interface Type | USB, Bluetooth |
| Application | Desktop, Tablet, Laptop |
| Language | English |
| Certification | CE, FCC |
| Length | 335 mm |
| Width | 140 mm |
| Height | 43 mm |
| Weight | 858g ± 20g |
User Tips
- Battery Management: To prolong battery life, consider turning off the keyboard or using wired mode when not actively using it, especially if you have intense RGB lighting effects enabled.
- Customization: Experiment with different switch types to find your preferred typing feel, thanks to the hot-swappable design. Explore the macro programming software for personalized keybinds and lighting profiles.
- Firmware Updates: Periodically check the official Redragon website for any available firmware updates for your K681 PRO keyboard. Updates can improve performance, add features, or fix bugs.
- Keycap Care: While dual-injection keycaps are durable, regular cleaning helps maintain their appearance and tactile feel. Avoid harsh chemicals that could degrade the plastic.
Warranty and Support
REDRAGON products are designed and manufactured to the highest quality standards. For warranty information, technical support, or service inquiries, please refer to the warranty card included with your product or visit the official REDRAGON website. Keep your proof of purchase for warranty claims.