1. Introduction
This manual provides detailed instructions for the setup, operation, maintenance, and troubleshooting of your Transformers TF-Crystal 85 Keys Mechanical Keyboard. Please read this manual thoroughly before using the product to ensure proper functionality and longevity.

Image 1.1: Transformers TF-Crystal 85 Keys Mechanical Keyboard with its packaging, showcasing the transparent design and RGB lighting.
2. Product Overview
2.1 Key Features
- 85-Key Layout: Compact 75% design retaining essential functions, arrow, and navigation keys.
- Tri-Mode Connectivity: Supports Bluetooth 5.0, 2.4GHz wireless, and USB-C wired connections.
- Hot-Swappable PCB: Compatible with most 3-pin and 5-pin mechanical switches, allowing for easy customization and replacement.
- Linear Switches: Pre-lubricated switches with a 50 million keystroke lifespan for durability and smooth operation.
- Gasket Structure: Incorporates high-quality gasket materials and a silicone pad to absorb vibrations and reduce typing noise.
- Customizable RGB Backlight: Features 20 built-in backlight modes, 16.8 million color options, and dynamic music rhythm effects.
- Programmable Driver: Enables macro customization, key function remapping, and advanced lighting control.
- Long Battery Life: Equipped with a 4000mAh battery, providing up to 240 hours of continuous use in 2.4GHz mode without backlighting.
- Wide Compatibility: Supports Mac, Windows, iOS, Android, PC, Laptop, Smartphone, Tablet, Switch, Xbox, and PlayStation.
- Transparent Design: Features transparent keycaps and base for enhanced aesthetic appeal.
3. Setup
3.1 Charging the Keyboard
Before initial use, fully charge the keyboard. Connect the provided USB-C cable to the keyboard's USB-C port and the other end to a powered USB port (e.g., computer, wall adapter). The charging indicator will show the charging status.
3.2 Connecting via 2.4GHz Wireless Mode
- Locate the 2.4GHz USB receiver, typically stored in a compartment on the keyboard.
- Plug the USB receiver into an available USB port on your computer.
- Toggle the mode switch on the keyboard to the 2.4G position.
- The keyboard will automatically connect to your device.
3.3 Connecting via Bluetooth 5.0 Mode
- Toggle the mode switch on the keyboard to the BT position.
- Press and hold Fn + 1 (or Fn + 2, Fn + 3) for 3-5 seconds until the indicator light flashes rapidly, indicating pairing mode.
- On your device (computer, tablet, smartphone), enable Bluetooth and search for new devices.
- Select "TF-Crystal 85" from the list of available devices to pair.
- Once paired, the indicator light will stop flashing and remain solid. You can pair up to three Bluetooth devices using Fn + 1, Fn + 2, and Fn + 3.
3.4 Connecting via USB-C Wired Mode
- Connect the provided USB-C cable to the keyboard's USB-C port.
- Connect the other end of the USB-C cable to an available USB port on your computer.
- The keyboard will automatically switch to wired mode and function without battery power.

Image 3.1: Diagram illustrating the three connection modes: Bluetooth 5.0, 2.4GHz wireless, and USB-C wired, compatible with various devices.
4. Operating Instructions
4.1 Switching Between Modes
Use the physical switch located on the keyboard to select between BT (Bluetooth), 2.4G (2.4GHz wireless), and USB-C (wired) modes.
4.2 RGB Backlight Control
The keyboard features customizable RGB backlighting. Use the following key combinations to adjust:
- Fn + Ins: Cycle through 20 different backlight effects.
- Fn + Del: Switch backlight colors within certain modes.
- Fn + ↑ / ↓: Adjust backlight brightness (5 levels).
- Fn + ← / →: Adjust backlight effect speed (5 levels).
- Fn + Esc (hold for 3s): Reset backlight settings to default.

Image 4.1: Visual guide for controlling RGB backlight effects, brightness, and speed using Fn key combinations.
4.3 Programmable Driver Usage
The keyboard includes a programmable driver for advanced customization. This driver allows you to:
- Macro Editing: Record and edit complex key sequences.
- Key Redefinition: Customize the function of individual keys.
- RGB Effect Customization: Fine-tune lighting modes, colors, and speeds, including music rhythm lighting effects.
Refer to the software's dedicated user interface for detailed instructions on using these features.

Image 4.2: Screenshot of the programmable driver interface, showing options for macro editing, RGB effects, and key redefinition.
4.4 Hot-Swapping Switches
The TF-Crystal 85 keyboard features a hot-swappable PCB, allowing you to change mechanical switches without soldering. This supports most 3-pin and 5-pin mechanical switches.
- Power off the keyboard or disconnect it from your device.
- Use the provided keycap puller to carefully remove the desired keycap.
- Use the provided switch puller to gently grip the switch from its top and bottom clips, then pull it straight up to remove it.
- Align the pins of the new switch with the holes on the PCB. Ensure the pins are straight.
- Gently press the new switch into place until it clicks securely. Do not force it.
- Replace the keycap.

Image 4.3: Illustration of the hot-swappable feature, showing how to remove and insert 3-pin/5-pin switches and the linear switch specifications.
5. Maintenance
5.1 Cleaning the Keyboard
- Disconnect the keyboard from all power sources before cleaning.
- Use a soft, lint-free cloth slightly dampened with water or a mild cleaning solution to wipe the keycaps and chassis.
- For dust and debris between keys, use compressed air or a small brush.
- Avoid using harsh chemicals or abrasive materials that could damage the keyboard's surface.
5.2 Battery Care
- Avoid fully discharging the battery frequently.
- Store the keyboard in a cool, dry place when not in use for extended periods.
- If the keyboard will not be used for a long time, charge it to about 50% before storage.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Keyboard not responding in wireless mode. | Low battery, incorrect mode selected, receiver not connected, Bluetooth not paired. | Charge the keyboard. Ensure the mode switch is set correctly (2.4G or BT). Re-insert the 2.4G receiver. Re-pair Bluetooth. |
| Keys not registering or double-typing. | Faulty switch, debris under keycap, software issue. | Clean under the keycap. Try hot-swapping the switch with a known working one. Restart your computer. |
| RGB backlight not working or incorrect. | Backlight turned off, incorrect settings, software conflict. | Adjust brightness using Fn + ↑. Cycle modes with Fn + Ins. Reset backlight with Fn + Esc (hold 3s). Check programmable driver settings. |
| Keyboard not charging. | Faulty USB-C cable, power source issue, keyboard port damage. | Try a different USB-C cable. Use a different USB port or power adapter. Ensure the cable is fully inserted. |
7. Specifications
| Feature | Detail |
|---|---|
| Model Number | TF-Crystal 85 |
| Key Layout | 85 Keys (75% Compact) |
| Connectivity | Bluetooth 5.0, 2.4GHz Wireless, USB-C Wired |
| Switch Type | Pre-lubricated Linear Mechanical Switches |
| Switch Lifespan | 50 Million Keystrokes |
| Hot-Swappable | Yes (3-pin/5-pin compatible) |
| Backlight | RGB (20 modes, 16.8 million colors) |
| Battery Capacity | 4000mAh |
| Battery Life (2.4G, no light) | Up to 240 hours |
| Battery Life (Backlit ON) | Approximately 22 hours |
| Dimensions (L x W x H) | 34.7 cm x 14 cm x 4.5 cm |
| Compatibility | Mac, Windows, iOS, Android, PC, Laptop, Smartphone, Tablet, Switch, Xbox, PlayStation |

Image 7.1: Visual representation of the keyboard's battery life: 240 hours with backlight off, 22 hours with backlight on, powered by a 4000mAh battery.
8. Warranty and Support
Transformers is committed to providing exceptional customer service. If you encounter any problems with your TF-Crystal 85 Keys Mechanical Keyboard, our after-sales support team is available to assist you. This includes technical support, exchanges, or installation guidance.
Please contact our customer service for assistance. We guarantee a hassle-free service experience.





