1. Product Overview
The Monster AC360 are innovative open-ear true wireless earphones designed for comfort, safety, and high-quality audio. Featuring Bluetooth 5.4 technology, these earbuds provide a stable connection and allow you to stay aware of your surroundings while enjoying your audio.
Key Features:
- True Open Ear Design: Sits gently on the ear, ensuring comfort for extended wear and situational awareness.
- Bluetooth 5.4: Provides a fast, stable, and low-latency wireless connection.
- Powerful Stereo Sound: Equipped with 14.2mm titanium PU vibrating diaphragm drivers for balanced audio, deep bass, and clear output.
- Smart AI Noise-Cancellation: Reduces environmental noise for clear call quality.
- Long Battery Life: Up to 8 hours on a single charge, with a total of 24 hours playtime using the charging case. Fast charging provides 1 hour of play from a 10-minute charge.
- IPX5 Waterproof: Earbuds are resistant to sweat and raindrops, suitable for various activities (charging case is not waterproof).
- Easy to Carry: Includes a liquid silicone lanyard for convenient portability.

2. Package Contents
Please check the package for the following items:

- Packaging Box
- Earphone (L & R)
- Charging Case
- Charging Cable (Type-C)
- Warranty Card
- User Guide
- Certificate of Conformity
3. Setup and First Use
3.1 Charging the Earphones and Case
Before first use, fully charge the earphones and the charging case.
- Place the earphones into the charging case.
- Connect the provided Type-C charging cable to the charging port on the case and to a USB power source.
- The charging indicators (if present) will show charging status.
- A full charge for the earphones takes approximately 1-1.5 hours. The charging case takes 1-2 hours.

3.2 Wearing the Earphones
The AC360 earphones feature an open-ear design for comfort and awareness.
- Gently place each earphone on the top of your ear, ensuring a secure and comfortable fit.
- The open-ear design means the earbuds do not go into your ear canal, allowing you to hear your surroundings.

3.3 Bluetooth Pairing
To connect your earphones to a device:
- Open the charging case. The earphones will automatically enter pairing mode.
- On your device (smartphone, tablet, etc.), enable Bluetooth.
- Search for "Monster AC360" in the list of available Bluetooth devices.
- Select "Monster AC360" to connect. Once connected, you will hear a confirmation tone.
- The earphones will automatically reconnect to the last paired device when taken out of the case, if Bluetooth is enabled on the device.

4. Operating Instructions
The Monster AC360 earphones feature intuitive touch controls on each earbud.

| Action | Left Earbud (L) | Right Earbud (R) |
|---|---|---|
| Single Tap | Volume - | Volume + |
| Double Tap | Play/Pause Music, Answer/End Call | Play/Pause Music, Answer/End Call |
| Triple Tap | Previous Song | Next Song |
| Long Press (2 Seconds) | Wake Up Voice Assistant, Reject Call | Wake Up Voice Assistant, Reject Call |
4.1 Making Calls
- Answer/End Call: Double tap either earbud.
- Reject Call: Long press either earbud for 2 seconds.
- The built-in microphone with Smart AI Noise-Cancellation ensures clear communication even in noisy environments.
4.2 Voice Assistant
- Activate Voice Assistant: Long press either earbud for 2 seconds. (Supports Apple Siri and Google Assistant).
5. Maintenance and Care
- Cleaning: Use a soft, dry cloth to clean the earphones and charging case. Do not use harsh chemicals or abrasive materials.
- Water Resistance: The earphones are IPX5 waterproof, meaning they are protected against sweat and light rain. They are NOT suitable for swimming or submersion in water. The charging case is NOT waterproof.
- 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.
- Battery Care: To prolong battery life, avoid fully discharging the earphones and charging case frequently. Charge them regularly, even if not used for extended periods.

6. Troubleshooting
- Earphones not pairing:
- Ensure both earphones are in the charging case and fully charged.
- Make sure Bluetooth is enabled on your device.
- Forget "Monster AC360" from your device's Bluetooth settings and try pairing again.
- Restart your device and the earphones (by placing them back in the case and taking them out).
- Only one earphone working:
- Place both earphones back into the charging case, close the lid, wait a few seconds, then open the lid and take them out. This often resets the connection between them.
- Ensure both earphones have sufficient battery.
- Poor sound quality or disconnections:
- Ensure the earphones are within the 10m Bluetooth range of your device and there are no major obstructions.
- Check for interference from other wireless devices.
- Clean the earphones to ensure no debris is affecting sound output.
- Earphones not charging:
- Ensure the charging cable is securely connected to both the case and the power source.
- Check if the charging case itself has power.
- Clean the charging contacts on both the earphones and inside the case.
7. Specifications
| Feature | Detail |
|---|---|
| Product Name | Monster AC360 |
| Brand | MONSTER |
| Wear Style | Open Ear |
| Material | ABS, Plastic |
| Bluetooth Version | 5.4 |
| Maximum Wireless Range | Approx. 10m (without obstruction) |
| Headset Battery Capacity | 50mAh |
| Charging Case Battery Capacity | 350mAh |
| Playtime (Single Charge) | Up to 8 hours (at 50% volume) |
| Total Playtime (with Case) | Up to 24 hours |
| Talk Time | 7 hours (at 50% volume) |
| Headset Charging Time | 1-1.5 hours |
| Case Charging Time | 1-2 hours |
| Charging Interface | Type-C (5V/0.5A) |
| Waterproof Rating | IPX5 (Earbuds only, case not waterproof) |
| Driver Diameter | 14.2mm |
| Frequency Response Range | 20 - 20000Hz |
| Impedance Range | Up to 32 Ω |
| Sensitivity | 110dB |
| Resistance | 32 Ω |
| Audio Codecs | AAC, SBC |
| Microphone | Yes, with Smart AI Noise-Cancellation |
| Voice Assistant Support | Apple Siri, Google Assistant |
Note: All data are from Monster laboratory, but due to environmental changes, actual use may vary. Please refer to the actual use of prevail.
8. User Tips
- Stay Aware: The open-ear design is excellent for outdoor activities like running or cycling. Always be mindful of your surroundings for safety.
- Secure Fit: Ensure the earphones are comfortably and securely placed on your ears to prevent them from falling during movement.
- Use the Lanyard: For extra security during exercise or when you need to quickly remove the earphones, utilize the included liquid silicone lanyard.
- Clear Calls: Take advantage of the Smart AI Noise-Cancellation for calls, especially in busy environments, to ensure your voice is heard clearly.
- Quick Charge for Quick Use: If you're in a hurry, a 10-minute charge can provide approximately 1 hour of playback.
9. Warranty and Support
Your Monster AC360 earphones come with a warranty. Please refer to the included Warranty Card for detailed information regarding warranty coverage, terms, and conditions.
For technical support, troubleshooting assistance beyond this manual, or warranty claims, please contact the authorized Monster service center or your point of purchase. Keep your proof of purchase and the Warranty Card handy.
10. Frequently Asked Questions (FAQ)
- Q: Are these earphones suitable for swimming?
- A: No, the earphones have an IPX5 waterproof rating, which protects against sweat and splashes, but they are not designed for swimming or submersion in water. The charging case is not waterproof.
- Q: How do I know if the earphones are fully charged?
- A: The charging case and earphones typically have LED indicators that change color or turn off when fully charged. Refer to the specific indicator behavior mentioned in the full user guide (item 6 in package contents) for precise details.
- Q: Can I use only one earphone at a time?
- A: Yes, these true wireless earphones can often be used independently. Simply take one earbud out of the case, and it should connect to your device. The other earbud can remain in the case or be used later.