Introduction
This manual provides comprehensive instructions for the proper use, setup, and maintenance of your Monster Open Ear AC225 Headphones. Please read this manual thoroughly before using the product to ensure optimal performance and longevity. Keep this manual for future reference.
What's in the Box
Verify that all items are present in the package:
- Monster Open Ear AC225 Clip-On Earbuds
- Wireless Charging Case
- User Manual (this document)
Product Overview
The Monster Open Ear AC225 Headphones feature an open-ear design for comfort and situational awareness, along with advanced audio technology.

Image: The Monster Open Ear AC225 Headphones, showing both earbuds in black with gold Monster logos.
Key Features:
- Open-Ear Design: Allows awareness of surroundings while listening to audio.
- Lightweight Comfort: Each earbud weighs approximately 5.1g, designed for extended wear.
- 13mm Dynamic Drivers: Provides clear audio with defined bass and treble.
- Bluetooth 6.0 Connectivity: Ensures a stable wireless connection.
- ENC Microphone: Reduces background noise for clearer calls.
- IPX6 Water Resistance: Protects against sweat and splashes.
- Touch Control: Manages playback, calls, and voice assistant functions.
- Extended Playtime: Up to 8 hours on a single charge, with a total of 36 hours using the charging case.

Image: Diagram illustrating the ergonomic clip-on design, anti-drop technology, adaptive fit, and directional audio technology of the earbuds.
The ergonomic clip-on design ensures a secure and comfortable fit, adapting to the ear's shape and minimizing the risk of falling out during activity. Directional audio technology channels sound directly into the ear while reducing sound leakage.

Image: A person wearing the Monster Open Ear AC225 earbuds, demonstrating their discreet and comfortable fit for daily use.
Setup
1. 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.
- Place the earbuds into the charging case. Ensure they are correctly seated.
- Connect the charging case to a power source using a compatible USB-C cable (not included).
- The indicator lights on the case will show the charging status. Refer to the case's specific LED behavior for full charge indication.
- A full charge provides approximately 8 hours of listening time for the earbuds, with the case offering an additional 28 hours, totaling 36 hours.

Image: The Monster Open Ear AC225 earbuds and their charging case, highlighting the 8 hours of single charge playtime and 36 hours total playtime with the case.
2. Bluetooth Pairing
To connect your earbuds to a device:
- Ensure the earbuds are charged and placed in the charging case.
- Open the charging case. The earbuds will automatically enter pairing mode, indicated by flashing LED lights (refer to product for specific light patterns).
- On your device (smartphone, tablet, laptop), enable Bluetooth.
- Search for available Bluetooth devices. Select "Monster Open Ear AC225" from the list.
- Once connected, the earbuds' LED indicators will change (e.g., turn off or solid blue), and you may hear an audible confirmation.
- The earbuds will automatically reconnect to the last paired device when removed from the case, if Bluetooth is enabled on the device.

Image: A diagram illustrating the internal components of an earbud and the Bluetooth 6.0 chip, emphasizing stable and low-latency connectivity.
Operation
1. Wearing the Earbuds
The AC225 earbuds are designed to clip securely onto your ear. Gently place each earbud over your ear, ensuring the speaker portion is positioned correctly for optimal sound delivery without blocking the ear canal. Adjust for a comfortable and stable fit.

Image: A woman wearing the Monster Open Ear AC225 earbuds, demonstrating their lightweight and open-ear fit for all-day comfort.
2. Touch Controls
The earbuds feature touch-sensitive areas for controlling various functions. The controls are identical for both left (L) and right (R) earbuds unless specified.

Image: A visual guide to the touch controls for the Monster Open Ear AC225 earbuds, showing gestures for calls, music playback, and volume adjustment.
- 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).
- Volume Up: Single-tap R earbud.
- Volume Down: Single-tap L earbud.
- Play/Pause: Double-tap L/R earbud.
- Previous Song: Triple-tap L earbud.
- Next Song: Triple-tap R earbud.
Maintenance
Proper maintenance ensures the longevity and performance of your earbuds.
- Cleaning: Use a soft, dry, lint-free cloth to clean the earbuds and charging case. Do not use harsh chemicals or abrasive materials.
- Water Resistance: The earbuds are IPX6 water-resistant, meaning they can withstand sweat and light rain. Do not submerge them in water or expose them to high-pressure water jets. Ensure they are dry before placing them back in the charging case.
- 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.
- Battery Care: To preserve battery life, avoid fully discharging the earbuds or case frequently. Charge them regularly, even if not in constant use.

Image: The Monster Open Ear AC225 earbuds with water droplets, illustrating their IPX6 waterproof rating for protection against sweat and rain.
Troubleshooting
If you encounter issues with your Monster Open Ear AC225 Headphones, refer to the following common solutions:
| Problem | Solution |
|---|---|
| Earbuds not pairing |
|
| No sound or low volume |
|
| Earbuds not charging |
|
| Call quality issues |
|
Specifications
| Feature | Detail |
|---|---|
| Model Name | Open Ear AC225 Earbuds |
| Connectivity Technology | Wireless (Bluetooth) |
| Bluetooth Version | 6.0 |
| Bluetooth Range | 12 Meters |
| Audio Driver Size | 13 Millimeters |
| Battery Life (Earbuds) | Up to 8 Hours |
| Total Playtime (with Case) | Up to 36 Hours |
| Water Resistance Level | IPX6 (Water Resistant) |
| Control Type | Touch Control |
| Microphone | ENC-enhanced |
| Ear Placement | Open Ear |
| Weight (each earbud) | Approx. 5.1g |
| Material | Plastic, Silicone |
Safety Information
- Do not disassemble or modify the product.
- Avoid exposing the earbuds to extreme temperatures, direct sunlight, or fire.
- Keep the product away from children and pets.
- Use only approved chargers and cables.
- Do not use the earbuds at excessively high volumes for prolonged periods to prevent hearing damage.
- Be aware of your surroundings when using open-ear headphones, especially in traffic or hazardous environments.
Warranty and Support
Monster products are designed for reliability and performance. For warranty information, technical support, or customer service inquiries, please refer to the warranty card included with your purchase or visit the official Monster website. Please have your product model number (AC225) and proof of purchase ready when contacting support.
For further assistance, you may visit the Monster Store on Amazon.





