Introduction
Thank you for choosing the Monster MQO33 Wireless Bluetooth 5.4 Earphones. This manual provides detailed instructions on how to set up, operate, and maintain your new earphones. Please read this manual carefully before use to ensure optimal performance and longevity of your device.
Product Overview
The Monster MQO33 earphones offer an open listening experience with advanced audio technology and ergonomic design. They are designed for comfort and high-quality sound in various environments.

Monster MQO33 Wireless Earphones and Charging Cases
Video showcasing the features and design of the Monster MQO33 earphones.
Features
- Dolby Immersive Soundstage: A professionally tuned triple-driver system delivers crystal clear highs, rich mids, and theater-style bass, providing a realistic audio experience with precisely positioned instruments.
- Beamforming Privacy Shield: Directional audio technology is integrated to reduce sound leakage by up to 70%, ensuring private listening in various environments without disturbing others.
- Bluetooth 5.4 Lossless Transmission: Equipped with a new wireless 5.4 chip and pre-buffering technology for CD-quality audio streaming and enhanced interference resistance, minimizing signal drops.
- Large Capacity Battery Life: Offers approximately 5 hours of playback on a single charge for the earphones, extended to about 20 hours with the charging case.
- 360° Rotating Halo Design: Features ergonomic earhooks with a 15° tilt for a secure fit during physical activities, also serving as a stylish accessory.
- Universal One-Tap Pairing: Designed for instant connection with HarmonyOS, iOS, Android, and Windows devices.

Experience an open listening experience with hi-fi stereo surround sound and long battery life.

New upgraded styling with 360° rotation for the charging case.

Enjoy Dolby Atmos sound with left and right surround, providing a realistic sense of presence.

Equipped with a 13mm large dynamic speaker for rich sound details.

New wireless 5.4 chip for lossless audio transmission.

Directional audio delivery technology reduces sound leakage by over 98%.
Package Contents
The following items are included in your Monster MQO33 package:
- 1 x Packing box
- 1 x Charging case
- 1 x TYPE-C Charging cable
- 2 x Earphones (Left and Right)
Specifications

Detailed Headphone Parameters
| Attribute | Value |
|---|---|
| Product Model | Monster Maxstar MQO33 |
| Bluetooth Version | 5.4 |
| Charging Time | About 1.5 hours |
| Endurance Time (with charging case) | About 20 hours |
| Charging Port | Type-C |
| Battery Capacity (Headphone) | 30mAh |
| Battery Capacity (Charging Case) | 250mAh |
| Speaker Unit | 13mm |
| Effective Distance | >10M |
| Machine Sensitivity | 108dB ±3dB |
| Frequency Response Range | 20 - 20000Hz |
| Material | Metal, ABS, Silica Gel |
| Earcups Type | Sealed |
| Max Output | 10mW |
| Number Of Drivers | 13 |
| Driver Diameter | 13mm |
| Total Harmonic Distortion | 1% |
| Impedance Range | up to 32 Ω |
| Codecs | AAC |
| With Microphone | Yes |
| Is wireless | Yes |
| Support APP | Yes |
| Waterproof | No |
| Line Length | 0m |
| Sensitivity | 96dB |
| Plug Type | None |
| Active Noise-Cancellation | No |
| Volume Control | Yes |
| Control Button | Yes |
| Vocalism Principle | Dynamic |
| Wireless Type | Bluetooth |
| Communication | True wireless |
| Style | Ows ear hook headphones |
| Certification | CE |
| Origin | Mainland China |
| Resistance | 32 Ω |
| Support Memory Card | No |
| ANATEL Certificate_Number | 22792-23-16357 |
Setup
1. Charging the Earphones and Case
Before first use, ensure both the earphones and the charging case are fully charged.
- Place the earphones into the charging case.
- Connect the provided Type-C charging cable to the charging port on the case and a suitable USB power source.
- The charging indicator lights on the case will show the charging status.
- A full charge for both earphones and case takes approximately 1.5 hours.

Battery capacity and charging information.
2. Initial Pairing
To pair your Monster MQO33 earphones with a device:
- Open the charging case. The earphones will automatically enter pairing mode.
- On your device (smartphone, tablet, laptop), enable Bluetooth.
- Search for available Bluetooth devices and select "Monster MQO33" from the list.
- Once selected, the earphones will connect automatically. You will hear an audio prompt indicating successful pairing.
The earphones support universal one-tap pairing with HarmonyOS, iOS, Android, and Windows devices.

Smart compatibility with various devices.
Operating Instructions
Wearing the Earphones
The MQO33 earphones feature an OWS (Open Wearable Stereo) ear hook design. Gently place the ear hook over your ear, ensuring the speaker unit is positioned comfortably near your ear canal for optimal sound without blocking it entirely.

Ergonomic design for a comfortable fit.

Comfortable for various activities and environments.
Touch Controls
The earphones are equipped with smart sensors for easy and convenient touch operation. The Multi-Function Button (MFB) on each earphone allows control over various functions:

Detailed Touch Operation Guide
- Play/Pause: Double-click the left or right MFB.
- Activate Voice Assistant: Long press the left MFB for 2 seconds.
- Switch to Previous Song: Triple-click the left MFB.
- Switch to Next Song: Triple-click the right MFB.
- Volume Up: Click the right MFB.
- Volume Down: Click the left MFB.
- Answer/Hang Up Call: Double-click the left or right MFB.
- Reject Call: Long press the left or right MFB for 2 seconds.
- Game/Music Dual Mode Switching: Long press the right MFB for 2 seconds to switch between modes.
Call Functionality
The earphones feature microphone array beamforming to accurately capture vocals, ensuring clear HD calls.

Accurate vocal capture for HD calls.
Game Mode
The Game Frame Stabilization Engine ensures sound and picture synchronization in game mode, providing an immersive gaming experience.

Game frame stabilization engine for synchronized audio and video.
Maintenance
- Cleaning: Regularly clean the earphones and charging case with a soft, dry, lint-free cloth. Avoid using harsh chemicals or abrasive materials.
- Storage: When not in use, store the earphones in their charging case to protect them from dust and damage. Keep them in a cool, dry place away from extreme temperatures.
- Battery Care: To prolong battery life, avoid fully discharging the earphones and charging case frequently. Charge them regularly, even if not in constant use.
- Water Resistance: Note that these earphones are NOT waterproof. Avoid exposure to water, sweat, or high humidity to prevent damage.
Troubleshooting
- Earphones not pairing:
- Ensure the earphones are charged and out of the charging case.
- Turn off and on Bluetooth on your device.
- Forget the device from your Bluetooth list and try pairing again.
- Ensure the earphones are not connected to another device.
- No sound or low volume:
- Check the volume levels on both your device and the earphones.
- Ensure the earphones are properly connected to your device.
- Try playing different audio sources.
- Charging issues:
- Verify the charging cable is securely connected to both the case and the power source.
- Ensure the charging port is clean and free of debris.
- Try a different charging cable or power adapter.
- Intermittent connection:
- Move closer to your connected device to reduce interference.
- Avoid environments with strong Wi-Fi signals or other Bluetooth devices that might cause interference.
- Ensure there are no physical obstructions between the earphones and your device.
User Tips
- Optimal Comfort: Experiment with the ear hook positioning to find the most comfortable and secure fit for extended listening sessions.
- Sound Quality: For the best audio experience, ensure your audio source is of high quality and adjust your device's equalizer settings if available.
- Battery Management: For daily use, consider charging the case overnight to ensure both earphones and case are ready for the day.
- Mode Switching: Utilize the game/music mode switching feature to optimize audio performance based on your activity. Game mode prioritizes low latency, while music mode focuses on audio fidelity.
Warranty and Support
For warranty information or technical support, please refer to the documentation provided with your purchase or contact the retailer. Keep your proof of purchase for any warranty claims.