LTC NB681
LTC NB681 Nimbleback Wired 65% Mechanical Keyboard User Manual
Model: NB681 | Brand: LTC
Introduction
Thank you for choosing the LTC NB681 Nimbleback Wired 65% Mechanical Keyboard. This ultra-compact keyboard is designed for both gaming and productivity, featuring hot-swappable switches, dynamic RGB backlighting, and convenient connectivity options. This manual provides detailed instructions for setup, operation, maintenance, and troubleshooting to ensure you get the most out of your new keyboard.

Image: The LTC NB681 Nimbleback Mechanical Keyboard in white, showcasing its compact 65% layout and vibrant RGB backlighting.
What's in the Box
Upon unboxing your LTC NB681 keyboard, please ensure all the following items are present:
- LTC NB681 Nimbleback Mechanical Keyboard
- USB-C Cable (for wired connection)
- Extra Switches (for hot-swappable functionality)
- Keycap Puller
- Switch Puller
- User Manual (this document)
Video: An unboxing video of the LTC NB681 keyboard, showing the contents of the package including the keyboard, USB-C cable, extra switches, and tools.
Setup
- Connect the Keyboard:
Connect the provided USB-C cable to the Type-C port on the keyboard and the other end to an available USB port on your computer. The keyboard is plug-and-play and should be recognized automatically by your operating system (Windows 7/8/10, iOS, MAC system).

Image: Close-up view of the LTC NB681 keyboard's side, highlighting the detachable Type-C wired connection port and two built-in USB 2.0 passthrough ports for connecting other devices.
- Adjust Keyboard Angle:
The keyboard features foldable feet at the back, allowing you to adjust the typing angle for ergonomic comfort. You can choose between a flat position or an elevated angle (approximately 10 degrees) using the feet.

Image: Diagram illustrating the ergonomic design of the LTC NB681 keyboard, showing the foldable feet for 10-degree tilt and anti-slip pads for stability.
- Frame Style (Optional):
The keyboard comes with a detachable frame, allowing you to switch between an "Embedded Style" (frame attached) and a "Floated Style" (frame removed) based on your aesthetic preference.

Image: The LTC NB681 keyboard with its detachable frame, illustrating how it can be configured for either an embedded or floated keycap appearance.
Operating Instructions
Keyboard Layout and Keys
The LTC NB681 features an ultra-compact 65% layout with 68 keys, including dedicated arrow, navigation, and control keys for a balance of functionality and space-saving design.

Image: A visual comparison demonstrating the compact size of the LTC NB681 68-key keyboard next to a standard full-size keyboard, highlighting its space-saving design while retaining essential arrow, control, and navigation keys.
RGB Backlighting
The keyboard offers dynamic RGB backlighting with 18 preset modes. You can adjust the brightness and flowing speed of these effects.
- Changing Modes: Refer to the keyboard's function layer key combinations (usually Fn + specific keys) to cycle through the 18 preset backlight modes.
- Adjusting Brightness: Use Fn + ↑ / ↓ to adjust the backlight brightness (5 levels available).
- Adjusting Speed: Use Fn + ← / → to adjust the flowing speed of dynamic modes.

Image: The LTC NB681 keyboard displaying its dynamic RGB backlighting, with callouts indicating 18 available backlight modes and 5 adjustable brightness and flowing speed levels.
Hot-Swappable Switches
The hot-swap PCB allows for easy replacement of 3-pin or 5-pin MX-style mechanical switches without soldering. This enables customization of your typing experience.

Image: A collection of icons representing key features of the LTC NB681 keyboard, including 68-keys, 2 USB ports, detachable Type-C cable, hot-swappable switches, ergonomic angle, RGB backlight, stand-alone arrow keys, and anti-ghosting.
Professional Software Support
Utilize the powerful LTC drive software to remap key functions, assign macros, and further customize RGB lighting effects. This software is compatible with Windows 7/8/10, iOS, and MAC systems.
- Key Remapping: Change the function of any key to suit your workflow.
- Macro Assignment: Create complex sequences of commands and assign them to a single key.
- RGB Customization: Fine-tune lighting effects beyond the onboard presets.

Image: Screenshot of the LTC keyboard's professional software interface, demonstrating options to customize RGB backlighting, remap keys, and assign macros for personalized keyboard functionality.
Maintenance
- Cleaning:
Regularly clean your keyboard to prevent dust and debris buildup. Use a soft brush or compressed air to remove particles between keycaps. For surface cleaning, use a slightly damp, lint-free cloth.
- Keycap and Switch Removal:
When removing keycaps, use the provided keycap puller to avoid damaging the keycaps or switches. For switch removal, use the switch puller. Apply gentle, even pressure.
- Avoid Liquids:
Keep liquids away from the keyboard to prevent internal damage. In case of spills, immediately disconnect the keyboard and allow it to dry completely before reconnecting.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Keyboard not responding | Loose cable connection, driver issue, or faulty USB port. | Ensure the USB-C cable is securely connected to both the keyboard and the computer. Try a different USB port. Restart your computer. Check device manager for driver issues. |
| RGB lighting not working or incorrect | Incorrect lighting mode selected, software conflict, or a faulty LED. | Cycle through lighting modes using Fn key combinations. Ensure the LTC software is updated and not conflicting with other lighting software. If a specific LED is out, it may indicate a hardware issue. |
| Keys not registering or double-typing | Dust/debris under keycap/switch, faulty switch, or software issue. | Remove the keycap and clean around the switch. If the issue persists, try replacing the switch with one of the spares provided. Update or reinstall the LTC software. |
| Software not detecting keyboard | Software not installed correctly, outdated software, or USB connection issue. | Download and reinstall the latest LTC drive software from the official website. Ensure the keyboard is directly connected to a USB port (avoiding hubs if possible). |
Specifications
- Model: NB681
- Layout: 65% (68 Keys)
- Switch Type: Hot-swappable (compatible with 3-pin/5-pin MX-style switches)
- Backlighting: Dynamic RGB (18 preset modes, 5 brightness/speed levels)
- Connectivity: Wired USB Type-C
- Additional Ports: 2 x USB 2.0 Passthrough Ports
- Dimensions: 13.3 x 4.1 x 1.6 inches (33.8 x 10.5 x 4.1 cm)
- Weight: 1.98 pounds (0.9 kg)
- Compatibility: Windows 7/8/10, iOS, MAC system
Warranty and Support
For warranty information and technical support, please refer to the official LTC website or contact their customer service directly. Keep your purchase receipt as proof of purchase for warranty claims.
LTC Official Store: Visit the LTC Store on Amazon
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