1. Introduction
The ProtoArc XK03 is an ultra-slim, 360-degree foldable ergonomic Bluetooth keyboard designed for enhanced portability and comfortable typing across multiple devices. Its unique V-shape split keyset promotes a natural typing position, reducing strain on hands and wrists. Ideal for travel and business trips, this keyboard offers seamless connectivity and a long-lasting rechargeable battery.

Figure 1: ProtoArc XK03 Ergonomic Foldable Keyboard with phone stand and tablet.
Video 1: Product demonstration showcasing quiet typing, ergonomic design, slimness, fast Bluetooth connection, multi-device switching, magnetic closure, and Type-C charging.
2. Package Contents
Please check the package for the following items:
- ProtoArc XK03 Ergonomic Foldable Bluetooth Keyboard
- USB-C Charging Cable
- User Manual
3. Product Features
- Ergonomic Split Design: Unique V-shape with 166-degree angle and split keyset for natural typing.
- Ultra Slim & 360° Foldable: Compact design for easy portability; unfolds to power on, folds to power off.
- Magnetic Closure: Strong magnetic adsorption prevents accidental opening.
- Multi-Device Connectivity: Connects up to 3 Bluetooth devices simultaneously (Fn+Q/W/E).
- Wide Compatibility: Supports Mac OS, iOS, Android, and Windows operating systems.
- Type-C Rechargeable: Built-in lithium battery with 150 days standby time and 2 hours for a full charge.
- Elegant PU Leather: Soft touch, anti-skid, anti-scratch, and anti-fingerprint finish.
- Quiet and Fluid Typing: Designed for a comfortable and silent typing experience.

Figure 2: Ergonomic split design for natural typing posture.

Figure 3: Ultra-slim and 360-degree foldable design.
4. Setup Guide
4.1 Power On/Off
- Power On: Simply unfold the keyboard. It will automatically power on.
- Power Off: Fold the keyboard. It will automatically power off.
4.2 Bluetooth Pairing
The keyboard can connect to up to three devices. Follow these steps to pair:
- Unfold the keyboard to power it on.
- Press and hold the
Fnkey and one of the Bluetooth channel keys (Q,W, orE) for 3-5 seconds until the corresponding indicator light (BT1, BT2, or BT3) flashes white. This indicates the keyboard is in pairing mode. - On your device (laptop, tablet, or smartphone), go to Bluetooth settings and search for new devices.
- Select "ProtoArc XK03" from the list of available devices.
- Once connected, the indicator light will stop flashing and remain solid white for a few seconds before turning off.
- Repeat these steps for up to two additional devices using the other Bluetooth channel keys (
Fn+WandFn+E).

Figure 4: Bluetooth indicator lights (BT1, BT2, BT3) and charging/Caps Lock indicator.
4.3 Charging the Keyboard
- Connect the provided USB-C charging cable to the keyboard's Type-C port and the other end to a USB power source (e.g., computer, wall adapter).
- The charging indicator (BT3 indicator, red) will illuminate while charging.
- Once fully charged (approximately 2 hours), the charging indicator will turn off.

Figure 5: Type-C charging port.
5. Operating Instructions
5.1 Switching Between Connected Devices
To switch between paired devices, simply press the Fn key along with the corresponding Bluetooth channel key (Q, W, or E) for the desired device. The keyboard will automatically connect to the selected device.

Figure 6: Multi-device connectivity with laptop, tablet, and smartphone.
5.2 Multimedia Function Keys
The keyboard features multimedia function keys accessible via the Fn key combinations:
- Press
Fn+F1-F10to get number 1-0. - Press
Fn+F1-F12to get multimedia functions (e.g., volume control, media playback). - Press
Shift+F1-F12to get symbols like !, @, #. - Press
Fn+Shift+F1-F12to get F1-F12 functions.

Figure 7: Multimedia Function Keys layout and combinations.
6. Maintenance
- Cleaning: Use a soft, damp cloth to clean the keyboard surface. Avoid harsh chemicals or abrasive materials.
- Storage: When not in use, fold the keyboard to protect the keys and conserve battery. Store in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Care: For optimal battery life, avoid fully discharging the keyboard frequently. Charge it when the low battery indicator appears.

Figure 8: Elegant PU Leather finish for durability and easy maintenance.
7. Troubleshooting
7.1 Keyboard Not Connecting/Pairing
- Ensure the keyboard is unfolded and powered on.
- Check if the keyboard battery is charged.
- Make sure Bluetooth is enabled on your device.
- Try unpairing and re-pairing the keyboard with your device.
- Ensure no other Bluetooth devices are interfering with the connection.
7.2 Keys Not Responding
- Check the battery level and charge if necessary.
- Ensure the keyboard is properly connected to your device.
- Restart your device and try connecting again.
- Clean any debris from around the keys.
7.3 Typing Lag or Disconnections
- Ensure the keyboard is within the effective Bluetooth range of your device.
- Minimize interference from other wireless devices.
- Check for any available software updates for your device's Bluetooth drivers.
8. Specifications
| Feature | Specification |
|---|---|
| Brand Name | ProtoArc |
| Type | Bluetooth Wireless |
| Operation Style | Capacitive |
| Interface Type | USB (for charging) |
| Keyboard Standard | Laptop keyboard |
| Application | Desktop, Laptop, Tablet |
| Language | English |
| Backlight Type | No backlight |
| Full Size keyboard | No |
| Wrist Support | No |
| Keycup material | ABS plastic |
| Switches Hot swap | No |
| Battery Included | Yes |
| Standby Time | 150 Days |
| Charging Time | 2 Hours (Full Charged) |
| Origin | Mainland China |
9. User Tips
- Keyboard Layout: If you require specific characters like 'Ñ' (tilde N), ensure your device's operating system keyboard layout is set to the appropriate language (e.g., Spanish ISO) to access these characters using standard key combinations.
- Ergonomic Adaptation: Allow for an initial adaptation period to get accustomed to the unique V-shape split design for optimal comfort and typing speed.
- Travel Companion: The magnetic closure and auto power-off feature when folded make it an excellent choice for on-the-go use, ensuring it doesn't accidentally turn on in your bag.
10. Warranty and Support
For warranty information and technical support, please refer to the official ProtoArc website or contact their customer service directly. Keep your purchase receipt as proof of purchase for any warranty claims.