Introduction
Thank you for choosing Monster Achieve 300 AirLinks Wireless Earbuds. These in-ear stereo headphones are designed to provide a high-quality audio experience with advanced features like Bluetooth 5.3 connectivity, smart touch controls, and extended playtime. This manual will guide you through the setup, operation, and maintenance of your new earbuds.
Safety Information
- Do not expose the earbuds or charging case to extreme temperatures, humidity, or liquids.
- Avoid dropping or subjecting the device to strong impacts.
- Do not attempt to disassemble or repair the earbuds yourself. Contact qualified service personnel.
- Keep out of reach of children and pets.
- Use only the provided charging cable or a certified USB-C cable for charging.
- Prolonged exposure to loud sounds may cause hearing damage. Adjust volume to a safe level.
Package Contents
Ensure all items are present in your package:
- Monster Achieve 300 AirLinks Wireless Earbuds (Left and Right)
- Charging Case
- USB-C Charging Cable
- Multiple Sizes of Ear Tips (S, M, L)
- User Manual (this document)
- Quick Start Guide

Image: The Monster Achieve 300 AirLinks earbuds are shown inside their open charging case, with one earbud removed and placed in front. The earbuds are black with gold Monster logos. The charging case is also black with indicator lights on the front.
Setup
1. Charging the Earbuds and Case
Before first use, fully charge the earbuds and the charging case. The case provides extended playtime for your earbuds.
- Place the earbuds into the charging case. Ensure they are properly seated.
- Connect the USB-C charging cable to the port on the charging case and plug the other end into a USB power source.
- The indicator lights on the case will show the charging status.
- A 10-minute quick charge can provide up to 2 hours of playtime.

Image: A graphic illustrating the battery life: 8 hours on a single charge for the earbuds, and an additional 24 hours from the charging case, totaling 32 hours. It also highlights fast charging: 10 minutes of charge provides 120 minutes of playtime.

Image: A close-up of the charging case showing the USB-C port with a charging cable inserted, indicating USB-C Quick Charge capability.
2. Pairing with Your Device (Bluetooth 5.3)
The earbuds utilize advanced Bluetooth 5.3 technology for a stable and high-quality connection.
- Ensure the earbuds are in the charging case.
- Open the charging case. The earbuds will automatically power on and enter pairing mode.
- On your mobile device, go to Bluetooth settings and turn on Bluetooth.
- Select "Monster Achieve 300 AirLinks" from the list of available devices to connect.
- Once connected, you will hear a confirmation tone, and the earbuds are ready for use.

Image: A visual representation of the Bluetooth 5.3 pairing process, showing the earbuds in their case next to a smartphone displaying its Bluetooth settings with "Monster Achieve 300 AirLinks" listed as connected.
3. Wearing the Earbuds
For optimal sound quality and comfort, ensure a proper fit.
- Choose the ear tip size (S, M, L) that best fits your ear canal for a secure and comfortable seal.
- Gently insert the earbud into your ear and twist slightly to secure it. The ergonomic design ensures a comfortable and secure fit without protruding.

Image: Two earbuds floating with feathers, emphasizing their lightweight design (each earbud weighs only 4 grams).

Image: A comparison showing the correct and incorrect ways to wear the earbuds. The correct method shows the earbud securely seated in the ear, while the incorrect method shows it protruding. A note indicates that incorrect wearing can result in no sound during calls.
Operating Instructions
Smart Touch Controls
The earbuds feature intuitive touch controls for easy management of music and calls.

Image: A diagram illustrating the touch control functions: single tap for Play/Pause and Answer/Hang Up, double tap for Previous/Next Track, and hold for Volume +/- and Voice Assistant.
| Action | Function |
|---|---|
| Single Tap | Play/Pause Music, Answer/End Call |
| Double Tap (Left Earbud) | Previous Track |
| Double Tap (Right Earbud) | Next Track |
| Hold (Left Earbud) | Volume Down |
| Hold (Right Earbud) | Volume Up |
| Triple Tap | Activate Voice Assistant |
Call Handling
The earbuds feature built-in microphones for clear calls.
- To answer an incoming call: Single tap either earbud.
- To end a call: Single tap either earbud during a call.
- To reject a call: Hold either earbud for 2 seconds.
- The earbuds support clear speakerphone calls with noise reduction technology.

Image: A person wearing an earbud, with text highlighting "Built-in microphones combined with ENC technology, provide crisp voice."
Maintenance
- Regularly clean the earbuds and charging case with a soft, dry cloth.
- Remove ear tips and clean them separately with mild soap and water if necessary, ensuring they are completely dry before reattaching.
- Avoid using abrasive cleaners or solvents.
- The earbuds are IPX6 waterproof, meaning they are resistant to strong jets of water. However, they are not designed for submersion. Dry them thoroughly if exposed to water.

Image: Two earbuds with water splashing around them, indicating IPX6 waterproof rating.
Troubleshooting
| Problem | Solution |
|---|---|
| Earbuds not pairing | Ensure earbuds are charged. Turn off and on Bluetooth on your device. Forget "Monster Achieve 300 AirLinks" from your device's Bluetooth list and re-pair. |
| No sound or low volume | Check device volume and earbud volume. Ensure earbuds are properly seated in your ears. Re-pair the earbuds. |
| Earbuds falling out | Try different sizes of ear tips for a more secure fit. Ensure earbuds are inserted correctly as shown in the manual. |
| Charging issues | Ensure the USB-C cable is securely connected to both the case and the power source. Try a different charging cable or power adapter. |
Specifications
| Feature | Detail |
|---|---|
| Model Name | MH12005 |
| Connectivity Technology | Wireless (Bluetooth 5.3) |
| Audio Driver Type | Dynamic Driver (10mm) |
| Frequency Range | 20 Hz - 20,000 Hz |
| Impedance | 30 Ohm |
| Control Method | Touch Control |
| Battery Life (Earbuds) | Up to 8 hours |
| Total Playtime (with Case) | Up to 32 hours |
| Charging Port | USB-C |
| Water Resistance | IPX6 |
| Item Weight | 4.2 ounces |

Image: An exploded view of an earbud showing its internal components, including a 10mm titanium diaphragm dynamic driver, and highlighting Bluetooth 5.3 connectivity for easy and stable connection.
Official Product Video
Video: An official product video showcasing the Monster Wireless Earbuds, Achieve 300 AirLinks Headphones. This video demonstrates key features such as pairing, touch controls, and usage scenarios, highlighting the product's design and functionality.
Warranty and Support
Monster Achieve 300 AirLinks Wireless Earbuds come with a 12-month worry-free service. If you have any questions or encounter any issues, please feel free to contact our customer support team for assistance.
For further support, please refer to the contact information provided in your Quick Start Guide or visit the official Monster website.





