1. Introduction
Thank you for choosing the Monster Open Ear AC225 Headphones. These wireless earbuds are designed to provide a comfortable listening experience while allowing you to remain aware of your surroundings. Featuring Bluetooth 6.0 connectivity, clear call quality with ENC technology, and IPX6 water resistance, the AC225 is suitable for various activities. This manual provides detailed instructions for setup, operation, and maintenance to ensure optimal performance.

Image 1: Monster Open Ear AC225 Headphones. This image displays the two purple earbuds, highlighting their open-ear design.
2. Package Contents
Please check the package for the following items:
- Monster Open Ear AC225 Earbuds (Left and Right)
- Charging Case
- USB-C Charging Cable
- User Manual (this document)
3. Product Overview
The Monster AC225 headphones feature an ergonomic clip-on design for secure and comfortable wear. Each earbud is equipped with a 13mm dynamic driver for audio output and an ENC-enhanced microphone for clear communication.

Image 2: 13mm Dynamic Driver. This diagram illustrates the internal structure of the earbud's 13mm dynamic driver, responsible for audio reproduction.
4. Charging the Earbuds and Case
Before first use, fully charge the earbuds and the charging case. The charging case provides additional power for the earbuds, extending their usage time.
4.1 Charging the Earbuds
- Place the earbuds into the charging case. Ensure they are correctly seated in their respective slots (L for left, R for right).
- The indicator lights on the earbuds will show their charging status.
4.2 Charging the Case
- Connect the USB-C charging cable to the charging port on the case and the other end to a power source (e.g., USB wall adapter, computer USB port).
- The indicator light on the charging case will illuminate to show charging status.
- A full charge provides approximately 8 hours of listening time for the earbuds, with the charging case extending total playtime up to 36 hours.

Image 3: Battery Life Overview. This image shows the earbuds and charging case, highlighting the 8-hour single charge and 36-hour total playtime.
5. Setup and Bluetooth Pairing
The AC225 headphones utilize Bluetooth 6.0 for a stable and efficient wireless connection.
5.1 Initial Pairing
- Ensure the earbuds are charged.
- Open the charging case. The earbuds will automatically enter pairing mode, indicated by a flashing LED light.
- On your device (smartphone, tablet, laptop), enable Bluetooth.
- Search for available Bluetooth devices and select "Monster Open Ear AC225" from the list.
- Once connected, the earbud indicator lights will stop flashing, and you will hear an audible confirmation.
5.2 Reconnecting
After initial pairing, the earbuds will automatically reconnect to the last paired device when removed from the charging case and within Bluetooth range.

Image 4: Bluetooth Pairing. This image shows the earbuds alongside a smartphone, illustrating the Bluetooth connection process.
6. Wearing the Earbuds
The AC225 headphones feature an open-ear, clip-on design for comfort and situational awareness.
- Identify the Left (L) and Right (R) earbuds.
- Gently clip each earbud onto your ear, ensuring the speaker portion is positioned over your ear canal without entering it.
- Adjust the adaptive bridge for a secure and comfortable fit. The design allows you to hear ambient sounds while enjoying your audio.

Image 5: Ergonomic Clip-On Design. This diagram highlights the secure and comfortable fit of the earbuds, including features like anti-drop technology and adaptive fit.
7. Operating Controls (Touch Control)
The AC225 earbuds are equipped with smart touch controls for easy management of audio playback, calls, and voice assistants.

Image 6: Touch Control Guide. This diagram provides a visual guide to the various touch gestures for controlling the earbuds' functions.
- Play/Pause: Double-tap L/R earbud.
- Next Song: Triple-tap R earbud.
- Previous Song: Triple-tap L earbud.
- Volume Up: Single-tap R earbud.
- Volume Down: Single-tap L earbud.
- Answer/End Call: Double-tap L/R earbud.
- Reject Call: Press and hold L/R earbud for 2 seconds.
- Activate Voice Assistant: Press and hold L/R earbud for 2 seconds (when not on a call).
8. Water Resistance (IPX6)
The Monster AC225 headphones are rated IPX6 water-resistant. This means they are protected against high-pressure water jets from any direction. They are suitable for use during workouts, running, and in light rain. However, they are not designed for submersion in water (e.g., swimming or showering).

Image 7: IPX6 Water Resistance. This image depicts the earbuds with water droplets, signifying their IPX6 waterproof capability.
9. Maintenance and Care
Proper maintenance ensures the longevity and performance of your 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 earbuds in their charging case to protect them from dust and damage. Store in a cool, dry place away from extreme temperatures.
- Avoid Water Exposure: While IPX6 rated, avoid prolonged exposure to water or submersion. Ensure the charging port is dry before charging.
10. Troubleshooting
If you encounter issues with your Monster AC225 headphones, refer to the following common solutions:
| Problem | Possible Solution |
|---|---|
| Earbuds not pairing with device |
|
| Only one earbud connects |
|
| No sound or low volume |
|
| Poor call quality |
|
11. Specifications
| Feature | Detail |
|---|---|
| Model Name | AC225 (E106) |
| Brand | Monster |
| Connectivity Technology | Wireless (Bluetooth 6.0) |
| Ear Placement | Open Ear |
| Audio Driver Type | 13mm Dynamic Driver |
| Noise Control | Environmental Noise Cancellation (ENC) |
| Water Resistance Level | IPX6 |
| Battery Life (Earbuds) | Up to 8 hours (single charge) |
| Total Playtime (with Case) | Up to 36 hours |
| Weight (each earbud) | 5.1g |
| Material | Plastic, Silicone |
| Compatible Devices | Cellphones, Tablets, Laptops, Smart Speakers |
12. Safety Information
Please read and follow these safety guidelines to prevent damage to your device or injury to yourself:
- Do not disassemble or modify the product.
- Keep the product away from extreme temperatures, direct sunlight, and open flames.
- Avoid exposing the product to strong magnetic fields.
- Do not use the product at excessively high volumes for prolonged periods to prevent hearing damage.
- Dispose of the product and its battery responsibly according to local regulations.
13. Warranty and Support
For warranty information or technical support, please refer to the warranty card included with your purchase or visit the official Monster website. You may also contact customer service through your retailer for assistance.





