1. Introduction
This manual provides essential information for the safe and effective operation, maintenance, and troubleshooting of your MERITLIFE 4D Massage Chair, Model MC-L39. Please read this manual thoroughly before using the product and retain it for future reference.

Figure 1.1: MERITLIFE 4D Massage Chair MC-L39.
2. Safety Instructions
WARNING: To reduce the risk of electric shock, burns, fire, or injury, always follow these basic precautions:
- Always unplug the chair from the electrical outlet immediately after use and before cleaning.
- Do not use while bathing or in a shower.
- Do not place or store the chair where it can fall or be pulled into a tub or sink.
- Do not reach for a chair that has fallen into water. Unplug immediately.
- Never operate the chair if it has a damaged cord or plug, if it is not working properly, if it has been dropped or damaged, or dropped into water.
- Keep the cord away from heated surfaces.
- Never drop or insert any object into any opening.
- Do not use outdoors.
- Do not operate where aerosol (spray) products are being used or where oxygen is being administered.
- To disconnect, turn all controls to the OFF position, then remove the plug from the outlet.
- This appliance is not intended for use by persons with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.
- Children should be supervised to ensure that they do not play with the appliance.
- Do not use the chair for more than 20 minutes at a time.
- Consult a physician before using if you have medical conditions.
3. Package Contents
Upon unpacking, please verify that all components are present:
- MERITLIFE 4D Massage Chair Main Unit
- Remote Control (LCD Touchscreen)
- Power Cord
- User Manual (this document)
- Small accessories (e.g., head cushion, back cushion)
4. Setup and Assembly
The MERITLIFE 4D Massage Chair MC-L39 is largely pre-assembled. Minimal setup is required.
4.1 Unpacking and Placement
- Carefully remove the chair from its packaging. It is recommended to have at least two people for this process due to the chair's weight.
- Ensure the doorway width is at least 29.9 inches (76 cm) for easy passage.
- Place the chair on a flat, stable surface. Ensure there is sufficient space around the chair for reclining functions (approximately 6.3 inches from the wall for zero gravity recline).
- Connect the power cord to the chair and then to a grounded electrical outlet.

Figure 4.1: Pre-assembled chair and space requirements.
4.2 Attaching Cushions
Attach the head cushion and back cushion as desired for comfort. These are typically secured with zippers or Velcro straps.
5. Product Overview
Familiarize yourself with the main components and controls of your massage chair.
5.1 Main Components
- Headrest: Adjustable for head and neck support.
- Backrest: Contains massage rollers and heating elements.
- Armrests: Integrated with shortcut keys and often airbags.
- Seat: Provides support and may include airbags.
- Leg Rest/Footrest: Extends and retracts, includes foot rollers and calf airbags.
- Remote Control: LCD touchscreen for comprehensive control.
- AI Voice Control Module: For hands-free operation.
- Bluetooth Speakers: Integrated for audio playback.

Figure 5.1: Front view of the massage chair.
6. Operating Instructions
This section details how to operate your MERITLIFE 4D Massage Chair.
6.1 Power On/Off
Press the power button on the remote control or armrest shortcut keys to turn the chair on or off.
6.2 Control Methods
The chair offers three primary control methods:
- LCD Touchscreen Remote: Provides full control over all massage functions, modes, intensity, and settings.
- Armrest Shortcut Keys: Quick access to common functions like power, recline, and mode switching.
- AI Voice Control: Use voice commands for hands-free operation. Say "Hello Nana" to activate, then issue commands like "Mode switch," "Zero gravity on," or "Heating on."

Figure 6.1: Three methods to control the massage chair.
6.3 Automatic Body Scanning
Upon starting a massage program, the chair performs an automatic body scan to detect your body shape and adjust the massage rollers for optimal coverage and a personalized experience. This ensures the massage targets key areas accurately.

Figure 6.2: Smart Auto Body Scan in action.
6.4 Massage Programs and Techniques
The chair features 24 automatic modes and 6 distinct massage techniques:
- Techniques: Kneading, Pushing, Slapping, Knocking, Tapping, Shiatsu.
- Intensity Levels: 6 adjustable intensity levels for rollers and airbags.
- Full Body Airbag Massage: Airbags located in shoulders, arms, calves, and feet provide compression massage.
- Foot Rollers: Precision-engineered rollers stimulate acupoints on the soles of your feet.

Figure 6.3: Available massage techniques.
6.5 Zero Gravity Recline
The chair offers multiple zero-gravity recline angles. This position elevates your knees above your heart, reducing spinal compression and promoting improved blood circulation. Select your preferred zero-gravity level via the remote or voice control.

Figure 6.4: Zero Gravity recline positions.
6.6 SL-Track Design
The extended SL-track guides the massage rollers along the natural curve of your spine, from your neck down to your glutes. This design ensures comprehensive coverage and deep tissue massage that adapts to your body's contours.
6.7 Heating Function
Activate the heating function for added comfort and muscle relaxation, typically located in the lumbar area.
6.8 Bluetooth Connectivity
Connect your device to the chair's integrated Bluetooth speakers to enjoy music or audio during your massage session. Pair your device through its Bluetooth settings.

Figure 6.5: Additional features including Bluetooth speakers and adjustable footrest.
7. Maintenance
Proper maintenance ensures the longevity and optimal performance of your massage chair.
7.1 Cleaning
- Wipe clean with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Ensure the chair is unplugged before cleaning.
- The removable cover on the pillow can be unzipped and washed as needed.
7.2 Storage
When not in use for extended periods, store the chair in a cool, dry place away from direct sunlight and extreme temperatures.
7.3 Moving the Chair
The chair is equipped with rear wheels for easy mobility. Tilt the chair backward and roll it to the desired location. Always ensure the chair is unplugged before moving.
8. Troubleshooting
Refer to this section for common issues and their solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Chair does not power on. | Power cord not properly connected. No power from outlet. | Check power cord connection. Test outlet with another device. |
| Massage rollers are not moving. | Program paused or not selected. Safety feature activated. | Ensure a massage program is active. Restart the chair. |
| Airbags are not inflating. | Airbag function is off or intensity is too low. | Check airbag settings on the remote. Increase intensity. |
| AI Voice Control not responding. | Microphone obstructed. Incorrect command. | Ensure clear speech and correct commands. Try saying "Hello Nana" again. |
| Bluetooth not connecting. | Chair's Bluetooth is off. Device is too far or not in pairing mode. | Ensure chair's Bluetooth is active. Place device closer and re-attempt pairing. |
If the problem persists after attempting these solutions, please contact MERITLIFE customer support.
9. Specifications
| Feature | Detail |
|---|---|
| Model | MC-L39 |
| Brand | MERITLIFE |
| Product Dimensions (D x W x H) | 69.3" x 29.9" x 46.9" (176 cm x 76 cm x 119 cm) |
| Item Weight | 212 pounds (96.16 kg) |
| Maximum Weight Recommendation | 400 Pounds (181.44 kg) |
| Suitable Height | 150cm-210cm / 4.9ft-6.7ft |
| Massage Track | Dual SL-Track (57.2 inches / 145 cm) |
| Massage Techniques | Kneading, Pushing, Slapping, Knocking, Tapping, Shiatsu |
| Auto Modes | 24 |
| Special Features | 4D Massage, Zero Gravity, AI Voice Control, Body Scan, Heating, Foot Rollers, Yoga Stretching, Bluetooth Speakers, Wireless Charging |
| Material | Premium Leather, Memory Foam |
| Power Supply | AC 110-120V, 50/60Hz (Typical for US market) |

Figure 9.1: Product dimensions and capacity.
10. Warranty and Support
Your MERITLIFE 4D Massage Chair MC-L39 comes with a manufacturer's warranty. Please refer to the warranty card included in your package for specific terms and conditions. For technical support, service, or warranty claims, please contact MERITLIFE customer service through the contact information provided on the warranty card or the official MERITLIFE website.
MERITLIFE Customer Service:
- Refer to your warranty card for contact details.
- Visit the official MERITLIFE website for support resources.