1. Introduction
Thank you for choosing the Monster Open Ear AC225 Earbuds. These wireless headphones are designed for comfort and high-quality audio, featuring an open-ear clip-on design, Bluetooth 6.0 connectivity, ENC microphone for clear calls, and IPX6 waterproofing. This manual provides detailed instructions for setup, operation, and maintenance to ensure optimal performance and longevity of your device.
2. What's in the Box
Please check the package contents to ensure all items are present:
- Open Ear Headphones (Earbuds)
- Wireless Charging Case
- User Manual (This document)

Image: The Monster Open Ear AC225 Earbuds and their wireless charging case, as typically found in the product packaging.
3. Product Overview
The Monster Open Ear AC225 Earbuds feature an ergonomic clip-on design for comfortable and secure wear, allowing you to stay aware of your surroundings. Each earbud is equipped with a touch control area and a microphone for calls.

Image: A detailed diagram illustrating the various components of the Monster Open Ear AC225 Earbuds, including the open-ear clip-on design, C-bridge, dynamic driver, AI-ENC call noise reduction, and Bluetooth 6.0 technology.

Image: A cutaway view highlighting the 13mm dynamic driver, responsible for delivering immersive sound with powerful bass and clear highs.
4. Setup
4.1. Charging the Earbuds and Case
Before first use, fully charge the earbuds and the charging case. Place the earbuds into the charging case. Connect the charging case to a power source using a compatible USB cable. The charging time is approximately 1 hour for a full charge, providing up to 8 hours of playtime per single charge and a total of 36 hours with the charging case.

Image: The Monster Open Ear AC225 Earbuds placed inside their charging case, illustrating the charging process and battery life indicators.

Image: An illustration showing the battery performance of the earbuds, with 8 hours of playtime on a single charge and up to 36 hours total with the charging case.
4.2. Pairing with a Device
- Initial Pairing: Open the charging case. The earbuds will automatically enter pairing mode.
- Activate Bluetooth: On your device (smartphone, tablet, laptop), enable Bluetooth.
- Select Device: Search for "Monster Open Ear AC225" in the list of available Bluetooth devices and select it to connect.
- Confirmation: Once connected, you will hear an audio prompt, and the earbuds will be ready for use.
The earbuds utilize Bluetooth 6.0 for a stable and low-latency connection.

Image: A smartphone displaying its Bluetooth settings, with the "Monster Open Ear AC225" earbuds shown as a connected device, illustrating the pairing process.

Image: A transparent view of an earbud highlighting the internal components and the Bluetooth 6.0 chip, indicating stable and lag-free connectivity.
5. Operating Instructions
5.1. Wearing the Earbuds
The AC225 earbuds feature an open-ear clip-on design. Gently clip each earbud onto your ear, ensuring the speaker is positioned correctly for optimal sound delivery while maintaining awareness of your surroundings. The adaptive bridge conforms to your ear for a secure and comfortable fit.

Image: A woman wearing the Monster Open Ear AC225 Earbuds, demonstrating the comfortable and secure fit of the clip-on design.

Image: A diagram illustrating the ergonomic clip-on design of the Monster Open Ear AC225 Earbuds, highlighting anti-drop technology, adaptive fit, and directional audio technology for secure and comfortable wear.

Image: A woman wearing the open-ear earbuds while walking near traffic, illustrating the benefit of staying aware of surroundings for safety.
5.2. Touch Controls
The earbuds feature intuitive touch controls on each earbud. Refer to the following table for common functions:

Image: A visual guide detailing the touch control functions for the Monster Open Ear AC225 Earbuds, including actions for calls, music playback, and volume adjustment.
| Function | Action (L/R Earbud) |
|---|---|
| Answer/End Call | Double tap L/R |
| Reject Call | Press and hold L/R for 2 seconds |
| Voice Assistant | Press and hold L/R for 2 seconds |
| Volume + | Single tap R |
| Volume - | Single tap L |
| Play/Pause | Double tap L/R |
| Previous Song | Triple tap L |
| Next Song | Triple tap R |

Image: A man tapping the side of an earbud, illustrating the touch control functionality for managing audio and calls.
5.3. Making and Receiving Calls
The earbuds feature an ENC-enhanced microphone for clear calls by reducing background noise. Use the touch controls as described above to manage your calls.

Image: A woman using the earbuds for a phone call in an outdoor setting, demonstrating the effectiveness of ENC technology for clear communication.
6. Maintenance
6.1. Cleaning
Regularly clean your earbuds and charging case to maintain optimal performance and hygiene. Use a soft, dry, lint-free cloth to wipe the surfaces. Avoid using abrasive materials, alcohol, or chemical cleaners.
6.2. Storage
When not in use, store the earbuds in their charging case to protect them from dust and damage. Store the case in a cool, dry place away from extreme temperatures.
6.3. Water Resistance (IPX6)
The Monster Open Ear AC225 Earbuds are rated IPX6 waterproof, meaning they are resistant to high-pressure water jets from any direction. This makes them suitable for workouts and use in light rain. However, they are not designed for submersion in water. Ensure the earbuds are dry before placing them back in the charging case to prevent damage.

Image: The Monster Open Ear AC225 Earbuds shown with water droplets, highlighting their IPX6 waterproof capability, suitable for resisting sweat and rain during activities.

Image: A man wearing the earbuds during a rainy outdoor activity, emphasizing their IPX6 waterproof rating against sweat and rain.
7. Troubleshooting
If you encounter issues with your earbuds, refer to the following common solutions:
- No Sound:
- Ensure earbuds are charged.
- Check if Bluetooth is enabled on your device and connected to "Monster Open Ear AC225".
- Adjust volume on both your device and the earbuds.
- Earbuds Not Pairing:
- Place earbuds back in the case, close it, then open it again to re-enter pairing mode.
- Turn off and on Bluetooth on your device.
- Forget "Monster Open Ear AC225" from your device's Bluetooth list and try pairing again.
- Ensure earbuds are sufficiently charged.
- Intermittent Connection:
- Ensure your device is within the Bluetooth range (up to 12 meters).
- Avoid obstacles between your device and the earbuds.
- Minimize interference from other wireless devices.
- Microphone Issues (ENC Clear Calls):
- Ensure the microphone is not obstructed.
- Check your device's audio settings to confirm the earbuds are selected as the input device.
- Touch Controls Not Responding:
- Ensure your fingers are clean and dry.
- Try restarting the earbuds by placing them in the case and taking them out again.
8. Specifications
| Feature | Detail |
|---|---|
| Model Name | Open Ear AC225 Earbuds |
| Brand | Monster |
| Connectivity Technology | Wireless (Bluetooth) |
| Bluetooth Version | 6.0 |
| Bluetooth Range | 12 Meters |
| Audio Driver Size | 13 Millimeters |
| Battery Life (Earbuds) | 8 Hours (single charge) |
| Total Playtime (with Case) | 36 Hours |
| Charging Time | 1 Hour |
| Water Resistance Level | IPX6 (Waterproof) |
| Noise Control Features | Environmental Noise Cancellation (ENC) |
| Control Method | Touch |
| Earpiece Shape | Clip On Earbuds |
| Item Weight | 5.3 ounces |
| Material | Plastic, Silicone |
| Included Components | Open Ear Headphones, User Manual, Wireless Charging Case |
9. Warranty & Support
Monster products are designed and manufactured to the highest quality standards. For information regarding warranty coverage, please refer to the warranty card included with your product or visit the official Monster website. If you require technical assistance or have questions not covered in this manual, please contact Monster customer support through their official channels.
Official Monster Store: Visit the Monster Store on Amazon





