1. Introduction
Thank you for choosing the LEOSO MN128 1/12 Scale 4WD RC Rock Crawler. This manual provides essential information for the safe operation, setup, maintenance, and troubleshooting of your new remote-controlled vehicle. Please read this manual thoroughly before operating the product to ensure proper function and longevity.
2. Safety Information
- Age Recommendation: This product is recommended for users aged 18 years and up. Adult supervision is advised for younger users.
- Battery Safety:
- Use only the provided batteries and charging cables.
- Do not overcharge batteries. Disconnect once fully charged.
- Do not expose batteries to extreme temperatures or direct sunlight.
- If batteries swell, discontinue use immediately and dispose of them properly.
- Keep batteries out of reach of children.
- Operating Environment:
- Operate the RC crawler in open areas, away from people, pets, and obstacles.
- Avoid operating near water, electrical wires, or busy roads.
- Do not operate in adverse weather conditions such as heavy rain or strong winds.
- General Precautions:
- Do not touch moving parts during operation to prevent injury.
- Turn off the vehicle and remote control when not in use.
- Store the product in a cool, dry place.
3. Package Contents
Please verify that all items listed below are included in your package.

Image: The LEOSO MN128 RC Crawler shown with its remote control, three batteries, three USB charging cables, a sticker sheet, and a small tool kit.
- LEOSO MN128 RC Crawler (1)
- Remote Control (1)
- 7.4V 1500mAh Lithium Polymer Battery (3)
- USB Charging Cable (3)
- Sticker Sheet (1)
- Product Manual (1)
- Small Tool Kit (1)
4. Setup
4.1 Charging the Batteries
The RC crawler uses 7.4V 1500mAh Lithium Polymer batteries. Ensure batteries are fully charged before first use.
- Connect each 7.4V 1500mAh battery to a separate USB charging cable.
- Plug the USB charging cables into a compatible USB power source (e.g., computer USB port, USB wall adapter).
- Charging typically takes approximately 3 hours per battery. The indicator light on the USB cable will change (e.g., red to green, or off) when charging is complete.
- Disconnect the batteries from the charging cables once fully charged.

Image: Three blue 7.4V 1500mAh batteries and three black USB charging cables, illustrating the charging components.
4.2 Installing Batteries in the RC Crawler
- Locate the battery compartment on the RC crawler. This is typically found under the chassis or accessible by removing the body shell.
- Open the battery compartment cover.
- Insert a fully charged 7.4V 1500mAh battery, ensuring correct polarity.
- Connect the battery connector to the vehicle's power connector.
- Securely close the battery compartment cover.

Image: An exploded view of the RC crawler's chassis, highlighting the internal components including the battery slot, motor, and suspension system.
4.3 Installing Batteries in the Remote Control
The remote control typically requires AA batteries (not included).
- Locate the battery compartment on the back of the remote control.
- Open the battery compartment cover.
- Insert the required AA batteries, observing correct polarity (+/-).
- Close the battery compartment cover securely.
4.4 Pairing the Remote Control
The 2.4GHz remote control system usually pairs automatically.
- Ensure both the RC crawler and the remote control have fresh batteries installed.
- Turn on the RC crawler first.
- Immediately turn on the remote control.
- The indicator lights on both devices should stabilize, indicating a successful connection. If not, turn both off and repeat the process.
5. Operating Instructions
5.1 Basic Controls
- Throttle Trigger: Pull the trigger to move forward, push to brake or reverse.
- Steering Wheel: Turn the wheel left or right to steer the vehicle.
- Trim Adjustments: Use the trim dials on the remote to fine-tune steering and throttle if the vehicle does not drive straight or stops when the trigger is neutral.

Image: The LEOSO MN128 RC Crawler navigating a sandy, off-road environment, demonstrating its 4x4 capability.
5.2 Driving Tips
- The MN128 is designed for various terrains including sand, grass, rocks, and muddy roads, thanks to its 4x4 mid-drive transmission and simulated rubber vacuum tires.
- Its 48mm high chassis design and up to 45° climbing angle provide strong kinetic energy for climbing over obstacles.
- The 390 strong magnetic motor allows for speeds up to 8km/h.
- The 2.4GHz remote control system ensures a long control distance and strong anti-interference ability, allowing multiple cars to operate simultaneously without signal issues.
- For optimal performance and battery life, avoid continuous high-speed operation and allow the motor to cool down between extended uses.
6. Maintenance
- Cleaning: After each use, especially in dirty or dusty conditions, gently clean the vehicle with a soft brush or cloth. Avoid using water directly on electronic components.
- Battery Care:
- Always fully charge batteries before storage if they will not be used for an extended period.
- Store batteries in a cool, dry place.
- Do not leave batteries connected to the vehicle when not in use.
- Inspection: Regularly inspect the tires, suspension, and steering components for any damage or wear. Replace worn parts as necessary.
- Lubrication: Periodically check and lubricate moving parts as recommended by RC vehicle maintenance practices.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Vehicle does not respond to remote. |
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| Vehicle drives slowly or lacks power. |
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| Steering is off-center. | Steering trim needs adjustment. | Adjust the steering trim dial on the remote control. |
| Short control range or interference. |
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8. Specifications
| Feature | Detail |
|---|---|
| Model Number | MN128 |
| Scale | 1:12 |
| Drive System | 4WD Mid-drive Transmission |
| Motor | 390 Strong Magnetic Motor |
| Speed | Up to 8 km/h |
| Control System | 2.4GHz Remote Control |
| Battery Type | 7.4V 1500mAh Lithium Polymer (3 included) |
| Charging Time | Approx. 3 hours per battery |
| Run Time | 20-25 minutes per battery |
| Chassis Design | 48mm High Chassis |
| Climbing Angle | Up to 45° |
| Vehicle Dimensions (Approx.) | 39cm (15.4in) Length x 19cm (7.5in) Width x 21cm (8.3in) Height |
| Product Dimensions (as listed) | 8 x 7 x 2 inches (May refer to packaging or a different measurement) |
| Item Weight (as listed) | 0.882 ounces (Note: This weight appears unusually low for the product) |
| Manufacturer Recommended Age | 18 years and up |

Image: A diagram illustrating the physical dimensions of the LEOSO MN128 RC Crawler and its retail packaging. Vehicle dimensions are approximately 39cm (15.4in) length, 19cm (7.5in) width, and 21cm (8.3in) height.
9. Warranty and Support
LEOSO is committed to providing quality products and customer satisfaction. If you have any questions regarding your MN128 RC Crawler or encounter any quality issues, please contact our customer service team. We aim to provide a satisfactory solution within 24 hours, which may include a refund or replacement for quality-related problems.
For support, please refer to the contact information provided with your purchase or visit the official LEOSO store page.