RedThunder K75 Wireless Keyboard and Mouse Combo User Manual

1. Introduction

This manual provides detailed instructions for setting up and operating your RedThunder K75 Wireless Keyboard and Mouse Combo. This combo features three connection modes (Bluetooth, 2.4G wireless, and wired), dual system compatibility (Windows/macOS), RGB backlighting, and a rechargeable battery. Please read this manual carefully before use to ensure optimal performance and longevity of your device.

2. Package Contents

• RedThunder K75 Wireless Keyboard
• RedThunder Wireless Mouse
• 2.4G USB Receiver (located at the bottom of the keyboard or mouse)
• Type-C Data Cable
• User Manual

3. Specifications

4. Setup Guide

4.1 Initial Charging

Before first use, fully charge both the keyboard and mouse. Use the provided Type-C cable to connect the devices to a computer's USB port or a DC 5V charger. The keyboard requires approximately 5-6 hours for a full charge, and the mouse requires 1-2 hours. It is recommended to charge via a computer USB for 8 hours before initial use.

Image: RedThunder K75 Keyboard and Mouse connected via USB-C cable for charging.

4.2 Connection Modes

The RedThunder K75 combo supports three connection modes: Bluetooth (BT), 2.4G Wireless, and Wired. The USB receiver for 2.4G wireless mode is located at the bottom of the keyboard or mouse.

4.2.1 Wired Mode

Connect the keyboard to your computer using the provided Type-C data cable. The keyboard will automatically switch to wired mode. You can charge and use the keyboard simultaneously in this mode.

4.2.2 2.4G Wireless Mode

1. Locate the 2.4G USB receiver at the bottom of the keyboard or mouse.
2. Plug the USB receiver into an available USB port on your computer.
3. On the keyboard, press Fn + 4$ to enter 2.4G wireless mode.
4. Ensure the mouse's bottom switch is set to 2.4G mode.
5. The keyboard and mouse should connect automatically.

4.2.3 Bluetooth Mode

The keyboard supports three Bluetooth channels (BT1, BT2, BT3).

1. On the keyboard, press Fn + 1! to connect to BT1. Long press Fn + 1! for 3 seconds to enter pairing mode (the indicator light will flash).
2. On your device (laptop, tablet, Mac, etc.), enable Bluetooth and search for "RedThunder K75". Select it to pair.
3. Repeat the process with Fn + 2@ for BT2 and Fn + 3# for BT3 to connect to other devices.
4. To switch between connected Bluetooth devices, press Fn + 1!, Fn + 2@, or Fn + 3#.
5. Ensure the mouse's bottom switch is set to BT mode.

4.3 System Compatibility Switch

The keyboard supports both Windows and macOS operating systems.

• Press Fn + A to switch to Windows mode (blue backlight flash).
• Press Fn + S to switch to macOS mode (yellow backlight flash).

5. Operating Instructions

5.1 Keyboard Functions

5.1.1 CNC Knob Operation

The multi-function CNC metal knob allows for quick adjustments.

• Switch Modes: Long press Fn + Knob for 3 seconds to switch between Volume Adjustment Mode and Lighting Adjustment Mode.
• Volume Adjustment (in Volume Mode): Rotate the knob to adjust the system volume. Press the knob to mute/unmute.
• Lighting Adjustment (in Lighting Mode): Rotate the knob to adjust backlight brightness. Press the knob to cycle through RGB lighting effects.

Image: Close-up of the RedThunder K75 keyboard's CNC knob and indicator lights, detailing their functions.

5.1.2 RGB Backlight Adjustment

The K75 keyboard features customizable RGB backlighting.

• Switch Backlight Mode: Press Fn + [ to cycle through different lighting effects.
• Turn On/Off Backlight: Press Fn + ← (left arrow key).
• Adjust Backlight Speed: Press Fn + PgUp to increase speed, Fn + PgDn to decrease speed.
• Adjust Backlight Brightness: Press Fn + =+ to increase brightness, Fn + -_ to decrease brightness.
• Restore Factory Settings: Press and hold Fn + Esc for 3 seconds.

Image: RedThunder K75 keyboard showcasing RGB backlighting and key combinations for adjustment.

5.2 Mouse Functions

5.2.1 DPI Adjustment

The M75 optical gaming mouse offers 5 adjustable DPI levels.

• Press the DPI button to cycle through DPI settings: 800 (Red), 1000 (Blue, default), 1600 (Green), 2400 (Purple), 4800 (White).
• The mouse's indicator light will change color to reflect the current DPI setting.

5.2.2 RGB Light Adjustment

The mouse features 13 RGB light effects.

• Press the RGB button on the bottom of the mouse to switch between different light effects.
• Long press the DPI button for 3 seconds to turn the mouse's RGB lights on or off.

Image: RedThunder M75 Optical Gaming Mouse with its buttons and features labeled, including DPI and RGB controls.

6. Maintenance

• Cleaning: Use a soft, dry cloth to clean the keyboard and mouse. Avoid using harsh chemicals or abrasive materials.
• Battery Care: To prolong battery life, avoid fully discharging the devices frequently. Charge them regularly. If not used for an extended period, charge them at least once every three months.
• Storage: Store the devices in a cool, dry place away from direct sunlight and extreme temperatures.
• USB Receiver: Keep the 2.4G USB receiver in a safe place when not in use to prevent loss.

7. Troubleshooting

• Device Not Connecting:
  • Ensure the devices are charged. A red slow flash on the keyboard's connection light or mouse delay/light off indicates low battery.
  • Verify the correct connection mode (BT, 2.4G, Wired) is selected on both the keyboard and mouse.
  • For 2.4G, ensure the USB receiver is properly plugged in.
  • For Bluetooth, ensure your device's Bluetooth is enabled and the keyboard is in pairing mode (long press Fn+1!/2@/3#).
  • Try restarting your computer and the devices.
• Lag or Disconnection:
  • Check battery levels and recharge if necessary.
  • Ensure there are no strong wireless interference sources nearby.
  • Move the USB receiver closer to the keyboard/mouse if using 2.4G wireless.
  • For Bluetooth, try re-pairing the device.
• Backlight Not Working:
  • Ensure the backlight is turned on (Fn + ←).
  • Adjust brightness (Fn + =+).
  • Try restoring factory settings (long press Fn + Esc).
• Mouse DPI Not Changing:
  • Press the DPI button to cycle through the settings. Observe the color change of the mouse light.
• Knob Not Responding:
  • Ensure you are in the correct mode (Volume or Lighting) by long-pressing Fn + Knob.

8. Warranty and Support

The RedThunder K75 Wireless Keyboard and Mouse Combo comes with a 1-year warranty from the date of purchase. This warranty covers manufacturing defects and malfunctions under normal use.

For technical support, warranty claims, or any questions regarding your product, please contact RedThunder customer service through the retailer where you purchased the product or visit the official RedThunder website for contact information.