Monster E108
Monster Open Ear AC228 Wireless Headphones User Manual
Model: E108
Introduction
Thank you for choosing the Monster Open Ear AC228 Wireless Headphones. These innovative clip-on earbuds are designed to provide immersive audio while keeping you aware of your surroundings. Featuring advanced Bluetooth 6.0 connectivity, Environmental Noise Cancellation (ENC) for clear calls, and IPX5 water resistance, they are ideal for various activities, from daily commutes to sports. This manual will guide you through the setup, operation, and maintenance of your new headphones to ensure optimal performance and longevity.

Image: Monster Open Ear AC228 Headphones, highlighting all-day comfort and robust bass.
What's in the Box
Please check the package contents to ensure all items are present:
- 1 x Monster Open Ear AC228 Wireless Headphones
- 1 x Charging Cable
- 1 x User Manual (this document)

Image: The Monster Open Ear AC228 Wireless Headphones and their charging case.
Setup
1. Charging the Headphones
Before first use, fully charge your Monster Open Ear AC228 headphones. Place the earbuds into the charging case, and connect the charging cable to the case and a USB power source. The indicator lights on the case will show the charging status. A full charge provides up to 8 hours of playtime, with the charging case extending total playtime to 24 hours.
2. Pairing with Your Device
- Ensure the headphones are charged and within 10 meters (33 feet) of your device.
- Open the charging case. The earbuds will automatically enter pairing mode, indicated by a flashing light on the earbuds.
- On your device (smartphone, laptop, etc.), go to Bluetooth settings and turn Bluetooth on.
- Search for available devices and select "Monster AC228" from the list.
- Once connected, a voice prompt will confirm successful pairing, and the indicator lights on the earbuds will turn off or show a steady light.
The headphones will automatically reconnect to the last paired device when taken out of the case, if Bluetooth is enabled on the device.

Image: Diagram illustrating Bluetooth 6.0 technology for faster pairing and enhanced stability.
How to Wear
The Monster Open Ear AC228 headphones feature a clip-on design for a secure and comfortable fit. Follow these steps for optimal wearing:
- Gently place the earbud onto your ear, ensuring the main body rests comfortably on the outer ear.
- Rotate the earbud slightly to adjust the clip-on hook behind your ear, securing it in place.
- Ensure the sound output is directed towards your ear canal for the best audio experience.
The flexible nickel-titanium memory alloy and skin-friendly liquid silicone material adapt to different ear shapes, providing a lightweight and pressure-free wear suitable for long periods and various activities.

Image: Diagram showing the correct way to put on and adjust the Monster Open Ear Headphones for a comfortable and secure fit.

Image: A woman wearing the Monster Open Ear AC228 headphones, demonstrating the comfortable and secure clip-on design.
Operating Instructions
The Monster Open Ear AC228 headphones feature intuitive touch controls on each earbud. The functions are divided between the left (L) and right (R) earbuds for ease of use.
General Controls (Applicable to either L/R earbud):
- Click x 2: Answer/Hang up Call
- Press x 2s: Reject Call
- Click x 2: Play/Pause Music
- Press x 2s: Activate Voice Assistant
Left Earbud (L) Specific Controls:
- Click x 3: Previous Track
- Click x 1: Volume Down
Right Earbud (R) Specific Controls:
- Click x 3: Next Track
- Click x 1: Volume Up

Image: Visual guide to the touch controls on the Monster Open Ear Headphones for music playback, calls, and voice assistant.
Key Features
Pure Monster Sound
Equipped with 13mm dynamic drivers, these headphones deliver a rich, balanced audio experience with crystal-clear highs and deep, resonant bass across all music genres. Utilizing directional audio technology, sound is precisely transmitted into your ear canal, minimizing leakage and ensuring a private listening experience.

Image: An exploded view of the 13mm dynamic driver, illustrating the components responsible for Pure Monster Sound.

Image: A diagram showing how directional sound is precisely transmitted into the ear canal, ensuring a private listening experience.
Open Ear Design for Situational Awareness
The innovative open-ear design allows you to stay fully aware of your surroundings. This feature is crucial for safety during outdoor activities like running or cycling, and enables you to engage in conversations without removing your headphones.
ENC Noise Reduction for Clear Calls
Equipped with an ENC Adaptive Noise Reduction Algorithm and two microphones, these headphones effectively reduce background noise. This ensures your voice is heard clearly during calls, even in noisy environments or during outdoor activities.

Image: A woman on a bus using the Monster Open Ear AC228 headphones, demonstrating the clear call quality provided by ENC technology.
IPX5 Water Resistance
Designed to withstand heavy sweat and rain, the Monster Open Ear AC228 headphones boast an IPX5 water resistance rating. This makes them an ideal companion for sports, workouts, cycling, or mountaineering, ensuring durability in various conditions.

Image: A man working out, wearing the Monster Open Ear AC228 headphones, illustrating their IPX5 water and sweat resistance.
Extended Battery Life
Enjoy up to 8 hours of continuous playtime on a single charge. With the compact charging case, the total battery life extends to approximately 24 hours, ensuring your music and calls last all day without interruption.

Image: A visual representation of the battery life, indicating 8 hours of playtime on a single charge and 24 hours with the charging case.
Specifications
| Feature | Detail |
|---|---|
| Model Name | E108 |
| Connectivity Technology | Wireless (Bluetooth 6.0) |
| Audio Driver Type | 13mm Dynamic Driver |
| Ear Placement | Open Ear |
| Noise Control | Environmental Noise Cancellation (ENC) |
| Battery Life | 8 hours (single charge), 24 hours (with charging case) |
| Water Resistance Level | IPX5 |
| Controller Type | Touch |
| Compatible Devices | Cellphones, Laptops |
| Material | Plastic, Skin-friendly Liquid Silicone |
| Item Weight | 5.9 ounces |
| Color | White |
Maintenance
Proper maintenance will extend the life of your Monster Open Ear AC228 headphones:
- Cleaning: Use a soft, dry, lint-free cloth to clean the earbuds and charging case. Do not use abrasive cleaners, alcohol, or chemical solvents.
- Storage: When not in use, store the headphones in their charging case to protect them from dust and damage. Store in a cool, dry place away from extreme temperatures.
- Charging: Avoid overcharging. Once fully charged, disconnect the charging cable. Charge regularly, even if not in frequent use, to maintain battery health.
- Water Exposure: While IPX5 water resistant, avoid submerging the headphones in water or exposing them to high-pressure water jets. Dry them thoroughly if they get wet from sweat or rain before placing them back in the charging case.
Troubleshooting
If you encounter issues with your headphones, please refer to the following common solutions:
| Problem | Possible Solution |
|---|---|
| Headphones do not turn on | Ensure the headphones are charged. Place them in the charging case and connect the case to a power source. |
| Cannot pair with device | Make sure Bluetooth is enabled on your device. Ensure the headphones are in pairing mode (flashing light). Try turning Bluetooth off and on again on your device. If previously paired, forget the device and re-pair. |
| No sound or low volume | Check the volume level on both the headphones and your connected device. Ensure the headphones are properly seated in your ears. Reconnect the Bluetooth connection. |
| Intermittent connection or audio drops | Ensure you are within the Bluetooth range (10 meters/33 feet) of your device. Avoid strong electromagnetic interference. Try disconnecting and reconnecting the Bluetooth. |
| Microphone not working during calls | Ensure the headphones are selected as the audio input device on your phone. Check for any obstructions on the microphone ports. |
| Touch controls are unresponsive | Ensure your fingers are clean and dry. Try restarting the headphones by placing them back in the case and taking them out again. |
Warranty and Support
Monster products are designed and manufactured to the highest quality standards. For information regarding warranty coverage, technical support, or service inquiries, please refer to the warranty card included with your purchase or visit the official Monster website. You may also contact the seller directly for assistance.
Online Support: For the latest FAQs and support resources, please visit the Monster official support page.
Customer Service: If you require further assistance, please contact our customer service team with your product model (E108) and purchase details readily available.
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