1. Product Overview
The Monster MQO33 OWS (Open Wireless Stereo) Bluetooth 5.4 Headphones are designed to provide a high-quality audio experience for music, gaming, and calls. Featuring an ergonomic open-ear design, Dolby Atmos sound, AI smart call noise cancellation, and ultra-low latency gaming mode, these earbuds offer comfort and advanced functionality.

Key Features:
- New Bluetooth 5.4 Chip for stable, low-power connection.
- Panoramic Stereo Surround Sound / Dolby Atmos Sound.
- Ergonomic Open-Ear Design for comfortable, seamless wearing.
- AI Smart Call Noise Cancellation for clear calls.
- Directional Sound Transmission Technology to reduce sound leakage.
- Ultra-Low Latency Gaming Mode for synchronized audio and video.
- Multi-Device Full Compatibility (mobile phones, tablets, laptops).
- 13mm Large Dynamic Speaker for rich sound details and enhanced bass.
- Up to 20 hours of comprehensive battery life (with charging box).
- Intuitive Touch Control for easy operation.

2. Getting Started
2.1 What's in the Box
- 2 x Bluetooth Earphones (Left and Right)
- 1 x Charging Case
- 1 x Type-C Charging Cable
- 1 x User Manual
2.2 Charging the Headphones
Before first use, fully charge the headphones and the charging case.
- Place the earphones into the charging case.
- Connect the Type-C charging cable to the charging port on the case and a suitable USB power source.
- The indicator lights on the case and earphones will show charging status.
- Charging time for the earphones is approximately 1.5 hours. The charging case takes about 2 hours to fully charge.

2.3 Pairing with a Device
The MQO33 headphones utilize a new Bluetooth 5.4 chip for efficient and stable connections.
- Ensure the earphones are charged and in the charging case.
- Open the charging case. The earphones will automatically enter pairing mode.
- On your device (smartphone, tablet, laptop), enable Bluetooth and search for new devices.
- Select "Monster MQO33" from the list of available devices.
- Once connected, you will hear a confirmation tone, and the indicator lights on the earphones will change.


3. Operation
3.1 Wearing the Headphones
The MQO33 features an ergonomic open-ear design for comfortable and secure wearing. Gently place the ear hooks over your ears and position the earbuds for optimal sound and comfort. The design allows for awareness of your surroundings while enjoying audio.


3.2 Touch Controls
The MQO33 headphones feature smart touch sensors for easy control of music playback, calls, and voice assistant functions.

| Action | Gesture |
|---|---|
| Play/Pause | Double-click Left/Right MFB |
| Activate Voice Assistant | Long press 2 seconds Left/Right MFB |
| Switch to Previous Song | Triple-click Left MFB |
| Switch to Next Song | Triple-click Right MFB |
| Volume Up | Click Right MFB |
| Volume Down | Click Left MFB |
| Answer/Hang Up Call | Double-click Left/Right MFB |
| Reject Call | Long press 2 seconds Left/Right MFB |
| Game/Music Mode Switching | Press and hold Right MFB for 2 seconds |
3.3 Sound Modes and Quality
The MQO33 headphones offer distinct modes for different audio experiences:
- Music Mode: Provides HiFi stereo surround sound with rich details, enhanced by the 13mm large dynamic speaker and Dolby Atmos sound technology.
- Game Mode: Features an ultra-low latency game frame stabilization engine, ensuring sound and picture are synchronized for an immersive gaming experience.



3.4 Call Functionality
The MQO33 headphones feature AI Smart Call Noise Cancellation and microphone array beamforming to accurately pick up your voice, ensuring clear communication even in noisy environments.

3.5 Directional Audio Delivery
Equipped with directional acoustic cavity structure and acoustic beam adjustment algorithm (DT super beam directional sound transmission), the MQO33 significantly reduces sound leakage by more than 98%, ensuring your audio remains private.

4. Maintenance
4.1 Cleaning
- Wipe the earphones and charging case with a soft, dry, lint-free cloth.
- Do not use abrasive cleaners, alcohol, or chemical solvents.
- Avoid getting moisture in any openings.
4.2 Storage
- Always store the earphones in their charging case when not in use to protect them and keep them charged.
- Store in a cool, dry place, away from extreme temperatures and direct sunlight.
4.3 Battery Care
- To prolong battery life, avoid fully discharging the earphones and charging case frequently.
- Charge the device regularly, even if not used for extended periods.
5. Troubleshooting
Common Issues and Solutions:
- No Power: Ensure the earphones and charging case are fully charged.
- Cannot Pair:
- Make sure Bluetooth is enabled on your device.
- Ensure the earphones are in pairing mode (open the charging case).
- Try turning Bluetooth off and on again on your device.
- If issues persist, try forgetting the device in your Bluetooth settings and re-pairing.
- No Sound:
- Check the volume level on both your device and the earphones.
- Ensure the earphones are properly connected to your device.
- Try playing audio from a different application or source.
- Poor Sound Quality:
- Ensure the earphones are within the effective wireless range (up to 10-20 meters).
- Avoid obstacles between the earphones and your device.
- Check for interference from other wireless devices.
- Earphones Not Charging:
- Ensure the charging cable is securely connected to both the case and the power source.
- Check if the charging port is clean and free of debris.
- Try using a different charging cable or power adapter.
6. Specifications

| Parameter | Value |
|---|---|
| Product Model | Monster Maxstar MQO33 |
| Brand | MONSTER |
| Bluetooth Version | V5.4 |
| Speaker Unit (Driver Diameter) | 13mm |
| Maximum Wireless Range | 10m - 20m |
| Charging Port | Type-C |
| Sensitivity | 108 dB |
| Frequency Response Range | 20 - 20000 Hz |
| Comprehensive Battery Life | Up to 20 hours (with charging box) |
| Headset Battery Capacity | 30 mAh |
| Charging Case Battery Capacity | 250 mAh |
| Headset Play Time | About 4 hours |
| Charging Time (Earphones) | About 1.5 hours |
| Charging Time (Case) | About 2 hours |
| Material | Plastic |
| Vocalism Principle | Dynamic |
| Impedance Range | up to 32 Ω |
| Number Of Drivers | 2 |
| Features | With microphone, Active Noise-Cancellation, Sound Isolating, Volume Control, Control Button |
| Function | for Video Game, Common Headphone, For Mobile Phone, HiFi Headphone, Sport, For Swimming, For Office, For Study |
7. Warranty and Support
Your Monster MQO33 OWS Bluetooth 5.4 Headphones come with a standard manufacturer's warranty. Please refer to the specific warranty terms provided at the time of purchase for details regarding coverage and duration.
Customer Support:
For technical assistance, warranty claims, or product inquiries, please contact the retailer or manufacturer's customer service. Contact information can typically be found on the product packaging or the official Monster website.
Please retain your proof of purchase for warranty purposes.





