1. Product Overview
The Monster AC311 are open-design wireless over-ear headphones featuring Bluetooth 5.4 connectivity, AI noise reduction for calls, and a long battery life. They are designed for comfort and stability during various activities, including sports and cycling.
Package Contents
- Monster AC311 Wireless Over-ear Earphones
- Charging Case
- USB Type-C Charging Cable
- User Manual
2. Getting Started
2.1 Charging the Earphones and Case
Before first use, fully charge your earphones and charging case.
- Place the earphones into the charging case.
- Connect the Type-C charging cable to the charging port on the case and to a power source.
- The charging indicator lights will show the charging status.
Charging Times:
- Earphones: Approximately 1.5 hours for a full charge.
- Total battery life with charging case: Up to 22 hours.
2.2 Wearing the Earphones
The AC311 earphones feature an ergonomic curved ear-hanging design for stable and comfortable wear.
- Identify the left (L) and right (R) earphones.
- Gently hook the earphone over your ear, ensuring the speaker part is positioned correctly in your ear canal.
- Adjust for a snug and comfortable fit. The open design ensures breathability and comfort even during extended use.
2.3 Bluetooth Pairing
The earphones utilize Bluetooth 5.4 for a stable and secure connection.
- Open the charging case. The earphones will automatically enter pairing mode (if not already paired).
- On your device (smartphone, tablet, etc.), enable Bluetooth.
- Search for "Monster AC311" in the list of available Bluetooth devices.
- Select "Monster AC311" to connect. Once connected, you will hear an audible confirmation.
3. Operating Instructions
The Monster AC311 earphones feature control buttons for easy management of audio and calls.
3.1 Basic Controls
The earphones are equipped with control buttons and volume control. Specific functions typically include:
- Play/Pause: Single press on either earphone.
- Next Track: Double press on the right earphone.
- Previous Track: Double press on the left earphone.
- Volume Up/Down: (Specific gesture or button press, refer to quick start guide if provided with product).
- Answer/End Call: Single press on either earphone during an incoming call or active call.
- Reject Call: Press and hold on either earphone during an incoming call.
- Activate Voice Assistant: Triple press on either earphone.
3.2 Call Noise Reduction
The AC311 features intelligent AI call noise reduction to ensure clear conversations.
- During a call, the AI noise reduction actively filters out ambient noise, making your voice clearer to the person on the other end.
4. Maintenance and Care
4.1 Cleaning
- Wipe the earphones and charging case with a soft, dry, lint-free cloth.
- Do not use harsh chemicals, cleaning solvents, or strong detergents.
- Avoid getting moisture into any openings.
4.2 Water Resistance
The Monster AC311 earphones are IPX5 waterproof, meaning they are resistant to water splashes and sweat. This makes them suitable for exercise and outdoor activities.
Important Note: The charging compartment is NOT waterproof. Do not expose the charging case to water or moisture.
4.3 Storage
- When not in use, store the earphones in their charging case to protect them and keep them charged.
- Store in a cool, dry place away from extreme temperatures.
5. Troubleshooting
If you encounter issues with your Monster AC311 earphones, try the following steps:
- No Sound: Ensure earphones are charged, connected to your device, and volume is up on both the earphones and your device.
- Cannot Pair: Make sure Bluetooth is enabled on your device and the earphones are in pairing mode. Try turning Bluetooth off and on again on your device.
- Intermittent Connection: Ensure you are within the maximum wireless range (<10m) of your device and there are no significant obstructions.
- Charging Issues: Check the charging cable and power source. Ensure the earphones are correctly seated in the charging case.
- Call Quality Issues: Ensure the microphone is not obstructed. The AI noise reduction should help, but extreme noisy environments may still affect clarity.
If problems persist, refer to the support section or contact customer service.
6. Specifications
| Feature | Specification |
|---|---|
| Brand Name | MONSTER |
| Model | AC311 |
| Style | Ows ear hook headphones (Over-ear) |
| Material | Plastic, Silica Gel |
| Communication | Wireless (Bluetooth) |
| Bluetooth Version | 5.4 |
| Wireless Range | <10m |
| Vocalism Principle | Dynamic |
| Number Of Drivers | 2 |
| Sound Unit | 16mm super large sound unit, rare titanium metal PU composite diaphragm, OFC oxygen-free copper multi-track voice coil |
| Impedance Range | up to 32 Ω |
| Earcups Type | Sealed |
| Active Noise-Cancellation | No (Features AI Noise-cancelling for calls) |
| With Microphone | Yes |
| Volume Control | Yes |
| Control Button | Yes |
| Codecs | AAC |
| Connectors | Type-C (for charging) |
| Charging Method | Charging case |
| Battery Life (single playback) | Approx. 7 hours (at 50% volume) |
| Total Battery Life (with case) | Approx. 22 hours |
| Waterproof Rating | IPX5 (earphones only) |
| Dimensions (Earphone) | Width: 58mm, Height: 145mm, Depth: 125mm |
| Weight | 180g |
| Certification | CE, FCC |
| Origin | Mainland China |
7. Warranty and Support
Your Monster AC311 earphones come with a standard manufacturer's warranty. Please retain your proof of purchase for any warranty claims.
For technical support, troubleshooting assistance, or warranty inquiries, please contact the retailer or the official Monster customer service channel.
8. User Tips
- Optimal Fit: Experiment with the ear-hook position to find the most secure and comfortable fit for your ear shape, especially during active use.
- Battery Preservation: Always store the earphones in their charging case when not in use to maximize battery life and protect them.
- Call Clarity: For the best call quality, ensure you are in a moderately quiet environment, allowing the AI noise reduction to perform optimally.
- Volume Management: To protect your hearing, avoid listening at high volumes for extended periods.
