Introduction
Welcome to the Monster AC330 Open-Ear Bluetooth Earphones user manual. These earphones are designed to provide a comfortable, ear-free listening experience with advanced features like Bluetooth 5.4 connectivity, intelligent noise reduction for calls, and IPX5 water resistance. This manual will guide you through the setup, operation, and maintenance of your new earphones to ensure optimal performance and longevity.

Package Contents
Please check the package carefully to ensure all items are present:
- 1 x Pair of Monster AC330 Open-Ear Bluetooth Earphones
- 1 x Charging Case
- 1 x Type-C Charging Cable
- 1 x User Manual (this document)
- 1 x Warranty Card
- 1 x Certificate

Product Overview
The Monster AC330 earphones feature an innovative open-ear design, providing comfort and awareness of your surroundings. The ergonomic ear hook style ensures a stable fit without entering the ear canal, making them ideal for extended wear and various activities.

The unique charging case features an all-metal rotating nacelle design, adding a touch of style and functionality. The earphones are equipped with 14.2mm super large moving coil drivers for a rich audio experience.

Setup
1. Charging the Earphones and Case
Before first use, fully charge the earphones and the charging case. Use the provided Type-C charging cable to connect the charging case to a power source.
- Headset Charging Duration: Approximately 1 hour for a full charge.
- Total Playtime with Charging Case: Up to 24 hours.
- Single Playtime: Up to 8 hours.

2. Bluetooth Pairing
The Monster AC330 earphones utilize advanced Bluetooth 5.4 technology for a fast and stable connection.
- Ensure the earphones are charged.
- Open the charging case. The earphones will automatically enter pairing mode.
- On your device (smartphone, tablet, etc.), go to Bluetooth settings and search for available devices.
- Select "Monster AC330" from the list to connect.
- Once connected, you will hear an audio prompt, and the earphones will be ready for use.

Operating Instructions
The Monster AC330 earphones feature intuitive touch controls for easy management of music and calls.

Music Control
- Volume Up (Right Earbud): Single knock
- Volume Down (Left Earbud): Single knock
- Play/Pause: Double knock (either L/R earbud)
- Previous Song: Triple knock (Left earbud)
- Next Song: Triple knock (Right earbud)
Call Management
The earphones support HD calls with multi-wheat intelligent noise filtering technology (DENOISE) for clear communication.
- Answer/End Call: Double knock (either L/R earbud)
- Reject Call: Long press for two seconds (either L/R earbud)

Voice Assistant
- Activate Voice Assistant: Long press for two seconds (either L/R earbud)
Specifications
| Feature | Specification |
|---|---|
| Brand | MONSTER |
| Model | AC330 |
| Wearing Style | Ear Hook (Open-Ear mode) |
| Speaker Specifications | Medium 14.2mm |
| Bluetooth Version | 5.4 |
| Audio Decoding | AAC, SBC |
| Charging Interface | Type-C |
| Waterproof Grade | Headset IPX5 (Charging bin is not waterproof) |
| Frequency Response Range | 20 - 20000Hz |
| Impedance Range | up to 32 Ω |
| Number of Drivers | 2 |
| With Microphone | Yes |
| Volume Control | Yes |
| Active Noise-Cancellation | No |
| Sound Isolating | No |

Maintenance
- Cleaning: Regularly wipe the earphones and charging case with a soft, dry cloth. Avoid using harsh chemicals or abrasive materials.
- Water Resistance: The earphones are IPX5 waterproof, meaning they are resistant to sweat and light rain. However, the charging case is NOT waterproof. Do not submerge the earphones or expose the charging case to water.
- Storage: When not in use, store the earphones in their charging case to protect them from dust and damage. Store 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 used for a long period.

Troubleshooting
| Problem | Solution |
|---|---|
| Earphones not pairing |
|
| No sound from earphones |
|
| Earphones not charging |
|
| Poor call quality |
|
User Tips
- Comfortable Fit: The open-ear design and ergonomic ear hooks are designed for comfort. Adjust the ear hooks gently to find the most secure and comfortable position for your ears.
- Stay Aware: Since these are open-ear earphones, you can hear your surroundings while enjoying audio. This is great for outdoor activities where situational awareness is important.
- Easy Portability: Utilize the exclusive liquid silicone lanyard (if included) to easily carry your charging case and earphones, preventing loss and ensuring they're always within reach.
- Quick Connect: Thanks to Bluetooth 5.4, simply opening the charging case will initiate a quick connection to your paired device, saving time.

Safety Information
- Do not attempt to disassemble or modify the earphones or charging case.
- Keep the product away from extreme temperatures, direct sunlight, and open flames.
- Avoid exposing the charging case to water or moisture.
- Use only the provided charging cable or a certified Type-C cable for charging.
- Do not use the earphones at excessively high volumes for prolonged periods to prevent hearing damage.
- Keep out of reach of children and pets.
Warranty and Support
Your Monster AC330 earphones come with a standard manufacturer's warranty. Please refer to the included warranty card for details regarding coverage and duration. For technical support, troubleshooting assistance, or warranty claims, please contact the retailer or Monster customer service.





