1. Introduction
This manual provides detailed instructions for the WANGCL 91803G RC Transmitter and RX41 Receiver Kit. This 3-channel 2.4GHz remote control system is designed for RC cars and boats, offering stable signal transmission and a range of up to 120 meters. It features an ergonomic pistol grip design for comfortable handling.

Image 1.1: WANGCL 91803G RC Transmitter and RX41 Receiver Kit.
2. Safety Information
- Always operate your RC vehicle in a safe and open area, away from people, pets, and obstacles.
- Ensure batteries are correctly installed and charged before use.
- Do not operate the RC system in wet conditions unless explicitly stated as waterproof. (Note: RX41 receiver is waterproof, but transmitter is not).
- Keep the transmitter and receiver away from extreme temperatures and direct sunlight.
- Adult supervision is recommended for children operating RC vehicles.
- Disconnect batteries from the RC vehicle and transmitter when not in use.
3. Package Contents
Verify that all items are present in your package:
- 1x WANGCL 91803G RC Transmitter
- 1x WANGCL RX41 RC Receiver
Note: 4x AAA batteries for the transmitter are not included and must be purchased separately.
4. Product Features
- Stable 2.4GHz Signal: Advanced 2.4GHz remote control technology provides a stable signal and allows for a 120-meter control distance, supporting multiple users simultaneously without interference.
- Intelligent VT System: Supports one-way wireless control with the included wireless receiver.
- Detachable Handle: The transmitter features a detachable handle for improved portability and ease of storage.
- Waterproof RX41 Receiver: The RX41 receiver is sealed to protect against water droplets, water sources, and water vapor, ensuring reliable performance in various conditions.
- Versatile Functions: Includes a low voltage alarm, center trim adjustment for steering and throttle, and a REV (reverse) function.
- Ergonomic Design: Pistol grip configuration and steering wheel are designed for comfortable and intuitive control, suitable for beginners.

Image 4.1: The RX41 receiver is designed with good sealing performance to block external water droplets, water sources, and water vapor, providing a high level of waterproofing for confident use.
5. Setup
5.1. Transmitter Battery Installation
- Locate the battery compartment on the bottom of the transmitter handle.
- Slide open the battery compartment cover.
- Insert 4x AAA batteries (not included) into the compartment, ensuring correct polarity (+/-).
- Close the battery compartment cover securely.
5.2. Receiver Installation and Binding
- Install the RX41 receiver into your RC car or boat according to your vehicle's instructions. Ensure it is securely mounted and the antenna is positioned for optimal signal reception.
- Connect the receiver to your vehicle's ESC (Electronic Speed Controller) and steering servo.
- Binding Procedure:
- Turn on the transmitter.
- Power on your RC vehicle (which powers the receiver).
- The transmitter and receiver should automatically bind. If not, consult the specific binding instructions for your ESC or vehicle, or look for a bind button/port on the receiver.
- Once bound, the LED indicator on the receiver should show a solid light.
6. Operating Instructions
6.1. Basic Controls
- Steering Wheel: Turn left or right to control the vehicle's direction.
- Throttle Trigger: Pull back to accelerate forward, push forward to brake or reverse.
6.2. Advanced Functions
6.2.1. Low Voltage Alarm
The transmitter is equipped with a low voltage alarm. When the battery voltage drops below 4.5V, the LED light on the transmitter will flash, and an audible beep will sound, indicating that the batteries need to be replaced.

Image 6.1: The transmitter's LED flashes and beeps when battery voltage is below 4.5V.
6.2.2. REV Function (Reverse Direction Adjustment)
The REV function allows you to reverse the direction of the steering (ST) or throttle (TH) channels if they are operating in the opposite direction to your input.
- To reverse Steering (ST) direction: Pull the steering wheel fully to the left or right and hold it. Press the "REV" button for approximately 5 seconds.
- To reverse Throttle (TH) direction: Pull the throttle trigger fully forward (brake/reverse) or fully back (accelerate) and hold it. Press the "REV" button for approximately 5 seconds.

Image 6.2: Location of the REV button on the transmitter for adjusting steering and throttle direction.
6.2.3. Center Fine-Tuning (Trim Adjustment)
This function is used to fine-tune the center position for steering (ST) and throttle (TH) to ensure the vehicle tracks straight and stops neutrally when controls are released.
- Throttle Trim (TH TRIM): To adjust the maximum throttle angle (forward/reverse), pull the throttle trigger fully forward or backward and hold it. Press the "TRIM+" or "TRIM-" buttons associated with TH to increase or decrease the maximum throw.
- Steering Trim (ST TRIM): To adjust the maximum steering angle (left/right), turn the steering wheel fully left or right and hold it. Press the "TRIM+" or "TRIM-" buttons associated with ST to increase or decrease the maximum throw.

Image 6.3: Trim buttons for steering (ST) and throttle (TH) adjustment.
7. Maintenance
- Cleaning: Use a soft, dry cloth to clean the transmitter and receiver. Avoid using harsh chemicals or solvents.
- Battery Care: Remove AAA batteries from the transmitter if it will not be used for an extended period to prevent leakage.
- Storage: Store the transmitter and receiver in a cool, dry place, away from direct sunlight and moisture.
- Receiver Waterproofing: While the RX41 receiver is waterproof, it is recommended to avoid prolonged submersion and to dry it thoroughly after exposure to water.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power to transmitter | Dead or incorrectly installed AAA batteries. | Replace batteries with new ones, ensuring correct polarity. |
| Vehicle not responding to transmitter | Not bound, out of range, or receiver not powered. | Perform binding procedure. Ensure vehicle and transmitter are within 120m range. Check receiver power connection. |
| Steering/Throttle operates in reverse | Channel direction is reversed. | Use the REV function to adjust the channel direction (see Section 6.2.2). |
| Vehicle drifts or doesn't stop centrally | Trim settings are off. | Adjust the ST TRIM or TH TRIM settings (see Section 6.2.3). |
| Transmitter beeps and LED flashes | Low voltage alarm activated. | Replace the AAA batteries in the transmitter immediately. |
9. Specifications
| Feature | Detail |
|---|---|
| Brand | WANGCL |
| Model Numbers | Transmitter: 91803G, Receiver: RX41 (Part No. INB25746) |
| Material | Plastic |
| Color | Black |
| Frequency | 2.4 GHz |
| Channels | 3 Channels |
| Control Range | Up to 120 meters |
| Transmitter Battery | 4x AAA batteries (not included) |
| Low Voltage Alarm | Activates when transmitter battery is below 4.5V |
| Receiver Waterproofing | Sealed against water droplets, water sources, and water vapor |
| Product Dimensions (Transmitter) | Approx. 137 x 162 x 68 mm (5.39 x 6.38 x 2.68 inches) |
| Product Weight | 170g (Transmitter, approx.) |
| Package Dimensions | 16 x 14.2 x 8.9 cm |
| GTIN / UPC | 713310694097 |

Image 9.1: Diagram showing the dimensions of the WANGCL 91803G RC Transmitter.
10. Warranty and Support
For warranty information and customer support, please refer to the retailer or manufacturer's official website where you purchased this product. Keep your proof of purchase for any warranty claims.