GoolRC Noble NB4+
GoolRC Flysky Noble NB4+ Radio Transmitter User Manual
Model: Noble NB4+
Brand: GoolRC
1. Introduction and Overview
The GoolRC Flysky Noble NB4+ is a high-performance 2.4GHz 8-channel radio transmitter designed for precise control of RC cars and boats. This system utilizes the advanced AFHDS 3 protocol, ensuring reliable and fast communication. This manual provides essential information for the proper setup, operation, and maintenance of your Noble NB4+ transmitter and the included FGr4S V2 receiver system.

Image: The GoolRC Flysky Noble NB4+ Radio Transmitter and its accompanying FGr4S V2 Receiver.
2. Package Contents
Before proceeding with setup, please verify that all components are present in your package:
- 1x Flysky Noble NB4+ Transmitter
- 1x Flysky FGr4S V2 Receiver
- 1x USB Cable
- 1x Accessories kit (includes different grips and extra springs)

Image: All items included in the GoolRC Flysky Noble NB4+ product package.
3. Setup Guide
3.1. Battery Installation and Charging
The Noble NB4+ features a dual battery system for extended operation. It includes one removable battery in the handle and a removable power bank in the base. The power bank in the base can charge the handle battery when connected. Use the provided USB Type-C cable for charging the transmitter.
3.2. Receiver Binding (FGr4S V2)
To establish communication between the transmitter and receiver, a binding process is required. Refer to the detailed instructions provided in the separate quick start guide for the specific binding procedure for the FGr4S V2 receiver.

Image: Detailed view of the Flysky FGr4S V2 Receiver, showing its compact size and connection ports.
4. Operating Instructions
4.1. Power On/Off
To power on the transmitter, press and hold the power button for approximately 1-2 seconds. Repeat the process to power off the device.
4.2. Basic Controls
The Noble NB4+ features a standard pistol-grip design with a steering wheel for directional control and a trigger for throttle input. Familiarize yourself with the physical layout and feel of these controls.
4.3. Touch Screen Navigation
The 3.5-inch 320x480 full dot matrix color IPS touch screen allows for intuitive navigation through menus and settings. Tap icons and swipe to access various functions and adjustments.

Image: The Noble NB4+ transmitter's high-brightness outdoor display, designed for clear visibility in various lighting conditions.
4.4. Channel Customization
The transmitter allows for customizing channel names, making it easier to identify and manage the function of each channel in real-time. This feature enhances user understanding and control.

Image: The channel customization interface on the Noble NB4+ screen, allowing users to rename channels for clarity.
4.5. Advanced Features
- Trainer Mode: The USB Type-C interface supports a coach mode, enabling interactive teaching with dual-ended Type-C data cables.
- Head Tracking Functionality: Connect a head tracking device via the dedicated cable to experience immersive control.
- Colorful UI Design: Customize themes and wallpapers on the display for a personalized user experience.

Image: The USB Type-C port on the Noble NB4+ transmitter, used for data output, charging, and advanced functionalities like trainer mode and head tracking.
5. Specifications
5.1. Noble NB4+ Transmitter Specifications
| Feature | Detail |
|---|---|
| Compatible Receiver | FGr4S V2 and other All AFHDS 3 protocol receivers |
| Compatible Models | Car or Boat |
| Number of Channels | 8 |
| Wireless Frequency | 2.4GHz ISM |
| Maximum Power | <20 dBm |
| Low Voltage Alarm | <3.65V |
| Data Output | USB Type-C |
| Charging Interface | USB Type-C |
| Antenna Type | Built-in single antenna |
| Display | 3.5-inch 320*480 full dot matrix color IPS touch screen |
| Resolution | 4096 |
| Input Power | 1S (4.35V)*4300mAh Lithium Polymer Battery + 3450mAh 18650 Battery |
| Distance | >300m (Ground distance without interference) |
| Online Update | Yes |
| Temperature Range | -10°C ~ +60°C |
| Humidity Range | 20%~95% |
| Size | 131.41*115.95*190.56mm |
| Weight | 520g |
5.2. FGr4S V2 Receiver Specifications
| Feature | Detail |
|---|---|
| PWM Channel | 4 |
| Wireless Frequency | 2.4GHz |
| Wireless Protocol | AFHDS 3 |
| Antenna Type | Built-in single antenna |
| Power | 3.5-8.4V |
| Data Port | PWM / PPM / i.bus/S.BUS |
| Temperature Range | -10°C ~ +60°C |
| Humidity Range | 20% -95% |
| Transmission Power | <20dBm |
| Working Current | 25mA/5V |
| Display | LED Indicator |
| Online Update | Yes |
| Size | 26*22*17.3mm |
| Weight | 5.1g |
6. Maintenance
6.1. Cleaning
Regularly clean the transmitter and receiver with a soft, dry cloth. Avoid using harsh chemicals or solvents that could damage the plastic or electronic components.
6.2. Battery Care
To prolong battery life, avoid overcharging or completely discharging the lithium polymer batteries. Store the device in a cool, dry place when not in use for extended periods.
6.3. Firmware Updates
The Noble NB4+ supports online firmware updates via its USB Type-C interface. Periodically check the official GoolRC or Flysky website for the latest firmware versions to ensure optimal performance and access to new features.
7. Troubleshooting
7.1. No Power
- Ensure batteries are properly installed and charged.
- Verify the power button is pressed and held for the required duration.
7.2. No Signal/Loss of Control
- Confirm the receiver is correctly bound to the transmitter.
- Check for potential 2.4GHz radio signal interference from other devices.
- Ensure the model is within the operational distance (>300m ground distance without interference).
- Avoid gripping the transmitter antenna during operation, as this can degrade signal quality.
7.3. Display Issues
- If the screen is unresponsive, try restarting the transmitter.
- Ensure the screen is clean and free from debris.
8. Safety Information
Please adhere to the following safety guidelines to ensure safe operation and prevent loss of control:
- To avoid 2.4Ghz radio signal interference, always keep your model in sight and within 300m. Ensure there are no other signals around that may block the RF signal and lead to loss of control.
- Never grip the transmitter antenna during operation. Doing so significantly degrades signal quality and strength and may cause loss of control.
- This product is recommended for users aged 14 years and up.
9. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the documentation included with your product or visit the official GoolRC website. Keep your proof of purchase for any warranty claims.
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