1. Safety Instructions
Before operating your REDLIRO Under Desk Treadmill, please read and understand all safety instructions. Retain this manual for future reference.
- Always place the treadmill on a flat, stable surface.
- Ensure adequate clearance around the treadmill during operation.
- Do not exceed the maximum user weight of 265 pounds.
- Keep children and pets away from the treadmill during operation.
- Always attach the safety key clip to your clothing before starting the treadmill. In case of emergency, pulling the safety key will immediately stop the machine.
- Wear appropriate athletic footwear during use.
- If the handlebars are in the upright position, ensure they are securely locked before use.
- Unplug the treadmill from the power outlet when not in use or before cleaning and maintenance.
2. Product Overview
The REDLIRO JK03F Under Desk Treadmill is a versatile 2-in-1 fitness solution designed for both walking and jogging. Its compact, foldable design makes it ideal for home and office use, allowing you to stay active without occupying excessive space.
Key Features:
- 2-in-1 Design: Easily switch between walking mode (0.5-4.0 MPH) and running mode (4.0-7.5 MPH).
- Quiet 2.5 HP Motor: Equipped with a high-power, low-noise motor (≤55 dB) for a peaceful workout environment.
- 5-Layer Shock Absorption: Features a multi-layer running belt (PVC, fiber, cotton yarn) and 4-point softer rubber for enhanced comfort and joint protection.
- Foldable & Portable: Folds in one step to a slim 4.7-inch thickness for easy storage and features built-in wheels for effortless relocation.
- LED Display & Remote Control: Track time, calories, speed, and distance with the clear LED display and adjust settings conveniently with the remote control.
- 12 Preset Programs: Offers a variety of training programs to diversify your workouts.

Image: The REDLIRO JK03F treadmill demonstrating its dual functionality for walking under a desk and traditional running with handlebars.
3. Setup
The REDLIRO JK03F treadmill is designed for quick and easy setup with minimal assembly required.
Unboxing and Initial Assembly:
- Carefully remove the treadmill and all components from the packaging.
- Place the treadmill on a flat, stable surface.
- Attach the handlebars (if desired for running mode) using the provided tools and screws. Ensure all screws are tightened securely.
- Connect the display board cable to the main unit.
- Insert the safety key into its designated slot on the console.
All necessary tools and screws, including extra screws and lubrication oil, are provided in the package for your convenience.
Video: Detailed unboxing and assembly guide for the REDLIRO treadmill, demonstrating how to set up the unit and attach the handlebars.
Folding and Moving:
- To fold: Loosen the knobs on the side of the handlebars, gently push the handlebars down until they are flat against the deck. Tighten the knobs to secure.
- To move: Tilt the folded treadmill and use the built-in wheels at the front to roll it to your desired storage location.

Image: The REDLIRO JK03F treadmill demonstrating its one-step folding mechanism, highlighting its compact 4.7-inch thickness for easy storage.
4. Operating Instructions
Familiarize yourself with the treadmill's controls and display for an effective workout.
Powering On/Off:
- Plug the power cord into a grounded outlet and turn on the main power switch located at the front of the treadmill.
- The LED display will illuminate.
- To turn off, press the power button on the remote or turn off the main power switch.
Using the Remote Control:
The remote control allows you to manage all treadmill functions conveniently.
- Start/Stop: Press the power button to start or stop the treadmill.
- Speed Adjustment: Use the '+' and '-' buttons to increase or decrease speed in 0.5 MPH increments.
- Mode (M): Cycle through different display modes (Time, Calories, Speed, Distance).
- Program (P): Select from 12 preset workout programs.
- Mute: Press the mute button to silence beeping sounds.

Image: The REDLIRO JK03F treadmill's LED display showing real-time exercise data (Time, Calories, Speed, Distance) and the included remote control.
LED Display:
The integrated LED display provides real-time feedback on your workout progress:
- Time: Duration of your workout.
- CAL: Calories burned.
- Speed: Current speed in MPH.
- DIST: Distance covered in miles.
Workout Modes:
- Walking Mode: Use without the handlebars for speeds between 0.5-4.0 MPH, ideal for working under a desk.
- Running Mode: Use with handlebars for speeds between 4.0-7.5 MPH, suitable for jogging.

Image: The REDLIRO JK03F treadmill illustrating its two primary modes: walking mode for use under a desk and running mode with the handlebars extended.
Bluetooth Connectivity:
The treadmill features Bluetooth connectivity, allowing you to connect your device and play music through its integrated speakers. Note that the speaker quality is basic and may not be suitable for high-fidelity audio.
Video: A user demonstrating the Bluetooth music playback feature of the REDLIRO treadmill, highlighting the integrated speakers.
5. Maintenance
Regular maintenance ensures the longevity and optimal performance of your treadmill.
Lubrication:
- The running belt requires lubrication every 2-3 months, depending on usage.
- Use the provided silicone oil. Lift the edge of the running belt and apply a small amount of oil to the center of the running deck.
- Run the treadmill at a low speed for a few minutes to distribute the lubricant evenly.
Belt Adjustment:
- If the running belt shifts to one side, use the included Allen wrench to adjust the tension bolts at the rear of the treadmill.
- Turn the bolt clockwise to move the belt to the right, and counter-clockwise to move it to the left.
- Adjust gradually and test the belt alignment after each adjustment.
Cleaning:
- Wipe down the treadmill's surfaces with a damp cloth after each use.
- Avoid using abrasive cleaners or solvents.
6. Troubleshooting
If you encounter any issues with your REDLIRO treadmill, refer to the following common solutions:
- Treadmill not starting: Ensure the power cord is securely plugged in, the main power switch is on, and the safety key is correctly inserted.
- Belt shifting: Refer to the 'Belt Adjustment' section in Maintenance to re-center the running belt.
- Remote control not responding: Check the remote's batteries. Ensure there are no obstructions between the remote and the treadmill's sensor.
- Unusual noises: Inspect the treadmill for any loose parts. If the noise persists, ensure the belt is properly lubricated.
For persistent issues or concerns not covered here, please contact REDLIRO customer support.
7. Specifications
| Feature | Specification |
|---|---|
| Brand | REDLIRO |
| Model Name | JK03F |
| Motor | 2.5 Horsepower |
| Speed Range | 0.5 - 7.5 Miles per Hour |
| Maximum Weight Recommendation | 265 Pounds |
| Product Dimensions (Unfolded) | 51.2"D x 24"W x 4.7"H |
| Folded Size | 51.2"D x 24"W x 4.7"H |
| Running Deck Length | 41.33 Inches |
| Running Deck Width | 15 Inches |
| Item Weight | 48.6 Pounds |
| Material | Alloy Steel |
| Special Feature | Foldable |
| Display Type | LED |
| Metrics Measured | Calories Burned, Speed |
| Included Components | Power Cord |
8. Warranty & Support
Warranty Information:
The REDLIRO Under Desk Treadmill JK03F comes with a 1-year manufacturer's warranty. This warranty covers defects in materials and workmanship under normal use and service conditions.
Please retain your proof of purchase for warranty claims.
Customer Support:
For any questions, technical assistance, or warranty claims, please contact REDLIRO customer support. Refer to the contact information provided in your product packaging or visit the official REDLIRO website.





