REDTHUNDER K75 WIRELESS
MECHANICAL GAMING KEYBOARD
The RedThunder K75 wireless mechanical gaming keyboard delivers premium gasket-mounted construction with hot-swappable switches in a compact 75% layout. Featuring a precision CNC volume knob, five-layer sound dampening, and tri-mode connectivity, the K75 offers the satisfying “creamy” typing experience of custom keyboards at an accessible price point.
Built for enthusiasts who demand superior acoustics and customization, the K75 combines pre-lubed linear switches, side-printed PBT keycaps, and RGB underglow lighting in a minimalist design. The gasket mount structure and extensive padding eliminate harsh resonance for a deep, muted sound signature that rivals keyboards costing significantly more.
Key Features
75% Compact Layout
81-key design retains function keys and arrows while saving desk space compared to full-size keyboards
CNC Volume Knob
Precision metal knob for volume control with light/sound mode switching capability
Gasket Mount
Premium gasket structure with 5-layer padding for superior acoustics and typing comfort
Hot-Swappable
Tool-free switch replacement supports 3-pin and 5-pin switches without soldering
Tri-Mode Wireless
Bluetooth 5.0, 2.4GHz wireless, USB-C wired with 3-device multi-pairing
RGB Underglow
16 preset modes with side RGB lighting for clean aesthetic with side-printed keycaps
Product Overview
75% Layout Design
The K75 adopts a 75% layout with 81 keys, striking the optimal balance between compactness and functionality. Unlike 60% keyboards that require extensive function layer use, the 75% layout retains dedicated function keys, arrow keys, and essential navigation keys while eliminating only the numeric keypad. This makes it ideal for productivity users who need full keyboard functionality in a space-saving design.
Gasket Mount Construction
The K75’s gasket mount design represents a significant upgrade over traditional tray-mount keyboards. The PCB is suspended within the case using flexible gaskets rather than being screwed directly to it. Combined with five layers of acoustic dampening material, this creates a typing stable platform that absorbs shock and eliminates harsh resonance. The result is the coveted “creamy” sound profile – deep, muted keypresses with satisfying thock.
Hot-Swappable Switches
Pre-installed with factory-lubed linear switches offering smooth, consistent performance, the K75’s hot-swap PCB allows effortless customization. Experiment with tactile, clicky, or different linear switches from any manufacturer. The pre-lubrication reduces friction and scratch, delivering premium typing feel out of the box. Spare pre-lubed switches are included for testing and replacement.
CNC Volume Knob
The precision-machined aluminum volume knob provides intuitive system volume control with satisfying tactile feedback. Long press for 5 seconds to toggle between light mode and sound mode. Short press to select lighting mode or mute/unmute audio. The knob’s premium feel and functionality elevate everyday interactions.
Knob Functions
- Rotate – Adjust system volume or backlight brightness
- Short Press – Select light mode / Toggle mute
- Long Press (5s) – Switch between light and sound modes
Tri-Mode Connectivity
The K75 supports three connection modes for maximum flexibility across different devices and use cases.
Connection Modes
- Bluetooth 5.0 – Pair up to 3 devices (FN+Q/W/E to switch)
- 2.4GHz Wireless – Low-latency gaming with USB receiver
- USB-C Wired – Zero latency with simultaneous charging
Dual System Support
Toggle between Windows and MacOS with dedicated top-mounted switch. The keyboard automatically adapts key mappings for each operating system, ensuring proper functionality of modifier keys and system shortcuts.
RGB Underglow Lighting
The K75 features RGB underglow lighting rather than traditional per-key backlighting. This design choice complements the side-printed keycaps for a clean, minimalist aesthetic while still providing vibrant illumination.
RGB Features
- 16 preset backlight modes
- South-facing LEDs for uniform lighting
- 8 side lighting modes (FN + Tab)
- Customizable via software (Windows only)
- Music rhythm mode syncs with audio
Lighting Shortcuts
- FN + Backspace – Toggle backlight on/off
- FN + Tab – Cycle side light modes
- FN + \| – Toggle backlight effect
- FN + PU – Cycle colors (pure color mode)
- FN + ↑↓←→ – Adjust brightness/speed
Technical Specifications
| Feature | Specification |
|---|---|
| KEYBOARD | |
| Layout | 75% compact (81 keys) |
| Knob | CNC aluminum volume/lighting control |
| Switch Type | Hot-swappable mechanical (pre-lubed linear) |
| Switch Support | 3-pin and 5-pin switches |
| Switch Lifespan | 50 million keystrokes |
| Mount Type | Gasket mount with 5-layer sound dampening |
| Keycaps | PBT dual-color side-printed (fade-resistant) |
| RGB Lighting | Underglow with south-facing LEDs |
| RGB Modes | 16 preset modes + 8 side modes |
| Connection | Tri-mode: Bluetooth 5.0 / 2.4GHz / USB-C wired |
| Multi-Device | Pair 3 Bluetooth devices (FN+Q/W/E) |
| System Support | Windows/MacOS toggle switch |
| Polling Rate | 1000Hz (wired/2.4GHz) |
| SOFTWARE | |
| K75-US Software | Windows only (2.4GHz/wired mode) |
| Programmability | Key remapping, macro definition, debounce |
| Customization | RGB effects, music rhythm backlight, key sensitivity |
| COMPATIBILITY | |
| Operating Systems | Windows, MacOS, Android, iOS |
| Gaming Consoles | PS4, PS5, Xbox (wired mode) |
| Package Contents | Keyboard, USB-C Cable, 2.4GHz Receiver, Switch Puller, Keycap Puller, Spare Switches, Manual |
| Warranty | 1 year manufacturer warranty |
Software & Customization
K75-US Software
Download the K75-US driver software for Windows to unlock comprehensive customization. Access via bit.ly/K75US in wired mode. Software features are only available in 2.4GHz wireless or wired connection modes.
Software Features
- Complete key remapping and macro programming
- Custom RGB lighting effects and colors
- Music rhythm backlight synchronization
- Adjust key sensitivity and debounce timing
- Configure sleep timer settings
- Per-key macro customization
Note: Side-printed keycaps mean legends are on the side of keys. Consider front-printed keycaps for better visibility if preferred.
Setup Instructions
Initial Setup
- Toggle left switch to select connection mode (BT/2.4G/Wired)
- Toggle right switch to select OS (Windows/Mac)
- For 2.4GHz: FN + R to pair (pre-paired from factory)
- For Bluetooth: Long press FN + Q/W/E to pair device 1/2/3
- Short press FN + Q/W/E to switch between paired devices
Charging
- Use original USB-C cable with data transfer capability
- Charge via computer USB port (DC 5V)
- Avoid non-original cables or high-voltage chargers
- USB hubs may provide insufficient power for charging
Package Contents
- 1x RedThunder K75 Wireless Mechanical Keyboard
- 1x USB-C Charging/Data Cable
- 1x 2.4GHz USB Wireless Receiver
- 1x Switch Puller Tool
- 1x Keycap Puller Tool
- Spare Pre-Lubed Linear Switches
- 1x User Manual with Software Guide