Introduction
The ProtoArc MECH K300 is a versatile mechanical keyboard designed for office and general use, offering multiple connectivity options and customizable features. It provides a comfortable and quiet typing experience with tactile feedback. This manual provides detailed instructions for setup, operation, maintenance, and troubleshooting.

Image: Top-down view of the ProtoArc MECH K300 wireless mechanical keyboard, showcasing its full layout with black keys and orange function keys.
Package Contents
- ProtoArc MECH K300 Wireless Mechanical Keyboard
- USB-C Charging Cable
- 2.4G USB Receiver
- Keycap Puller
- User Manual (this document)

Image: Contents of the ProtoArc MECH K300 package, including the keyboard, USB-C cable, USB receiver, keycap puller, and user manual.
Setup
Charging the Keyboard
Before first use, fully charge the keyboard using the provided USB-C cable. Connect the USB-C end to the keyboard and the USB-A end to a power source (e.g., computer USB port, USB wall adapter). The charging indicator light will show charging status.

Image: Close-up of the ProtoArc MECH K300 keyboard showing the USB-C port and charging cable connected, highlighting its 1900mAh rechargeable battery.
Connectivity Modes
The ProtoArc MECH K300 supports three connection modes: Wired, 2.4G Wireless, and Bluetooth (BT1, BT2). You can connect up to 4 devices simultaneously.
- Wired Mode (FN+F1): Connect the keyboard directly to your device using the USB-C cable. This mode also charges the keyboard.
- 2.4G Wireless Mode (FN+F2): Insert the 2.4G USB receiver into your device's USB port. The keyboard will automatically connect.
- Bluetooth Mode (FN+F3 for BT1, FN+F4 for BT2):
- Press and hold FN+F3 or FN+F4 for 3-5 seconds until the indicator light flashes rapidly, indicating pairing mode.
- On your device, search for Bluetooth devices and select "ProtoArc K300" to connect.
- Once connected, the indicator light will stop flashing.
Video: A short demonstration of the ProtoArc K300 keyboard's multi-device connectivity and features, including its backlit keys.
Operating Instructions
Backlight Modes
The keyboard features 14 changeable LED backlight modes. Use the dedicated keys to cycle through modes and adjust brightness/speed.
- FN + INS: Cycle through backlight modes.
- FN + ↑ / ↓: Adjust backlight brightness.
- FN + ← / →: Adjust backlight speed (for dynamic modes).

Image: The ProtoArc MECH K300 keyboard demonstrating various white adjustable backlight modes, including Breathing, Waterfall, and Constant bright, with 14 lighting options.
System Compatibility Switching
The keyboard is compatible with Windows, Mac OS X, and Android systems. Switch between Windows and Mac layouts with a single click.
- FN + A: Switch to Windows system layout.
- FN + S: Switch to Mac system layout.
Multimedia and Function Keys
The keyboard includes dedicated multimedia keys and a volume knob for convenient control.
- Volume Knob: Rotate to adjust volume, press to mute/unmute.
- Dedicated Media Keys: Play/Pause, Previous Track, Next Track.

Image: Close-up of the ProtoArc MECH K300 keyboard's volume knob, indicating its tactile and fluid operation.

Image: Close-up of the ProtoArc MECH K300 keyboard's dedicated media control keys, including play/pause, previous, and next track buttons.
Macro Programming
The ProtoArc MECH K300 supports macro programming for customized shortcuts and increased productivity. Programming software is available on the ProtoArc website and functions only in wired mode.

Image: A computer screen displaying the ProtoArc keyboard's macro definition software interface, indicating its suitability for graphic designers or gamers.
Maintenance
- Cleaning: Use a soft, dry cloth to wipe the keyboard surface. For deeper cleaning, use a keycap puller to remove keycaps and compressed air to clear debris.
- Battery Care: To prolong battery life, avoid fully discharging the keyboard frequently. Charge it when the low battery indicator appears.
- Storage: Store the keyboard in a cool, dry place away from direct sunlight and extreme temperatures.
Troubleshooting
| Problem | Solution |
|---|---|
| Keyboard not responding in wireless mode. | Ensure the keyboard is turned on and fully charged. Re-pair the 2.4G receiver or Bluetooth connection. Try switching to wired mode to confirm functionality. |
| Backlight not working or dim. | Check battery level and charge the keyboard. Adjust brightness using FN + ↑. Ensure no backlight mode is set to off. |
| Keys are not registering or double-typing. | Clean under the keycaps with compressed air. Ensure the keyboard is on a stable surface. If using wireless, check for interference or move closer to the receiver/device. |
| Cannot connect via Bluetooth. | Ensure the keyboard is in Bluetooth pairing mode (FN+F3/F4, flashing light). Remove previous pairings from your device and try again. Ensure your device's Bluetooth is enabled. |
Specifications
| Feature | Detail |
|---|---|
| Model Number | Protoarc B0BN1P2ZDR |
| Connectivity | Bluetooth 5.0, 2.4G Wireless, USB-C Wired |
| Keyboard Type | Mechanical, Low Profile Tactile |
| Backlighting | White LED, 14 Changeable Modes |
| Battery Capacity | 1900mAh Li-ion |
| Battery Life | Up to 30 days (with backlight), 120 days (backlight off) |
| Number of Keys | 104 |
| Dimensions | 18.11 x 6.69 x 1.57 inches |
| Weight | 1.98 pounds |
| Compatible OS | Windows XP/7/8/10 and above, Mac OS X 10.2 and above, Android 4.3 and above |
Warranty and Support
For warranty information and technical support, please visit the official ProtoArc website or contact their customer service. You can also refer to the official user manual PDF for additional details.





