1. Product Overview
The Plugfones Mercenary Tactical Bluetooth Headset is engineered to provide superior hearing protection and communication capabilities in high-noise environments. Featuring a 24dB Noise Reduction Rating (NRR), advanced ambient sound control, and a noise-isolating boom microphone, this headset ensures both safety and connectivity. Its durable design and comfortable gel cooling ear pads make it suitable for extended wear in demanding conditions.

2. Key Features
- Tactical Hearing Protection: Offers a 24dB Noise Reduction Rating (NRR) for effective ear protection in loud settings.
- Advanced Audio & Smart Controls: Features 5 levels of ambient sound adjustment with AMP/De-AMP technology to balance environmental noise. Includes a noise-isolating boom mic for clear communication and tactile buttons for easy control.
- High-Performance Specifications: Equipped with 40mm speakers for crisp audio, up to 60 hours of battery life, and USB-C charging.
- Durability & Comfort: IP42 sweat-resistant rating and ultra-comfortable gel cooling earmuffs reduce heat buildup during prolonged use. The boom mic is foldable for convenience.
- OSHA-Compliant: Meets ANSI and NIOSH standards, ensuring reliable performance in demanding environments.

3. Setup
3.1 Initial Charging
Before first use, fully charge your Mercenary headset. Connect the provided USB-C charging cable to the headset's charging port and a compatible USB power source. The charging indicator light will show the charging status.
3.2 Bluetooth Pairing
- Ensure the headset is powered off.
- Press and hold the power button until the indicator light flashes blue and red, indicating pairing mode.
- On your device (smartphone, tablet, etc.), enable Bluetooth and search for available devices.
- Select "Plugfones Mercenary" from the list. Once connected, the indicator light will turn solid blue.
3.3 Boom Microphone Setup
The noise-isolating boom microphone can be flipped up and out of the way when not in use. For optimal voice clarity during calls or communication, position the microphone close to your mouth.

4. Operating Instructions
4.1 Power On/Off
Press and hold the power button located on the left earcup for approximately 3 seconds to power the headset on or off.
4.2 Ambient Sound Modes (AMP/De-AMP)
The Mercenary headset features intelligent AMP/De-AMP technology with 5 levels of ambient sound adjustment. This system automatically detects and reduces loud noises (De-AMP) while amplifying voices and important sounds in noisy environments (AMP). Use the multi-function button toggles to cycle through the different ambient listening modes, including a higher volume ambient listening mode.

4.3 Volume Control
Adjust the volume using the dedicated volume control buttons on the left earcup. These buttons are designed to be easily operated even with gloves on.
4.4 Call Management & Music Playback
Once paired via Bluetooth, you can listen to music, take phone calls, and engage in communication. Use the multi-function button for call answering/ending and music playback controls (play/pause, skip tracks).
5. Maintenance
5.1 Cleaning
To maintain hygiene and performance, regularly wipe down the headset, especially the ear pads, with a soft, damp cloth. Avoid using harsh chemicals or abrasive cleaners. The gel cooling ear pads are designed to be easily cleaned.
5.2 Battery Care
To maximize battery lifespan, avoid fully discharging the headset frequently. Recharge the battery when the low battery indicator is active. The headset features an auto-shutoff function after 2 hours of inactivity to preserve battery life.

6. Troubleshooting
6.1 No Power
- Ensure the headset is fully charged.
- Check the USB-C charging cable and power adapter for damage.
6.2 Bluetooth Pairing Issues
- Make sure the headset is in pairing mode (flashing blue and red light).
- Ensure your device's Bluetooth is enabled and within range.
- Forget the device from your Bluetooth settings and attempt to re-pair.
6.3 Audio Problems
- Check the volume levels on both the headset and your connected device.
- Ensure the boom microphone is properly positioned for clear voice pickup.
- If ambient sound is too low or high, adjust the AMP/De-AMP settings using the multi-function button.
7. Specifications
| Feature | Detail |
|---|---|
| Model Name | Mercenary – Tactical Bluetooth Headset |
| Item Model Number | PF-MER-BL |
| Brand | Plugfones |
| Noise Reduction Rating (NRR) | 24dB |
| Noise Control | Sound Isolation |
| Ambient Sound Levels | 5 Levels (AMP/De-AMP) |
| Battery Life | Up to 60 hours |
| Charging Port | USB-C |
| Speaker Size | 40mm |
| Impedance | 32 Ohm |
| Rated Power | 10 mW |
| Frequency Response | 20 Hz - 20 KHz |
| Microphone Pickup Type | Omnidirectional |
| Water Resistance | IP42 (Sweat-resistant) |
| Item Weight | 364 Grams (12.8 ounces) |
| Package Dimensions | 9 x 8 x 5 inches |
| UPC | 862401000344 |
8. Warranty and Support
For detailed warranty information and product support, please refer to the official Plugfones website or contact their customer service. You can also visit the Plugfones Store on Amazon for additional resources.


