GREEN DEVIL Shield LD HM Bluetooth Hearing Protection Earmuffs

1. Overview

The GREEN DEVIL Shield LD HM Bluetooth Hearing Protection Earmuffs are designed to provide professional-grade hearing protection while allowing for communication and entertainment in noisy environments. These earmuffs feature advanced noise reduction capabilities, intelligent active listening for situational awareness, and Bluetooth 5.3 technology for stable wireless connectivity. They are specifically designed to integrate with most cap-style hard hats and safety helmets, offering a secure and comfortable fit for all-day use.

Image: GREEN DEVIL Shield LD HM Earmuffs showcasing Bluetooth 5.3, Smart Active Listening, Hands-Free Telephony, and Noise-Canceling Boom Microphone features.

2. What's in the Box

Upon opening the package, ensure all the following items are present:

• Bluetooth Earmuffs for Hard Hat
• Noise-Canceling Boom Microphone
• 3.5mm Audio Cable
• USB Type-C Charging Cable
• Instruction Manual
• Carrying Bag

Image: All components included in the GREEN DEVIL Shield LD HM Earmuffs package, including the earmuffs, microphone, cables, manual, and carrying bag.

3. Setup: Attaching to a Hard Hat

The GREEN DEVIL Shield LD HM earmuffs are designed for easy attachment to most cap-style hard hats and safety helmets with side accessory slots. Follow these steps for proper installation and adjustment:

1. Insert Card Slot (Fig. 1): Insert the hard hat slot adapters into the slots on each side of the hard hat until they click into place.
2. Adjustment of Position (Fig. 2 & 3): When in use, the attachment arms must be pushed inward until you hear a click on both sides, indicating a shift from "stand-by" to "usage" position. Position the ear cups over your ears so that the cushions fully enclose the ears and seal tightly against the head. Adjust the position of each ear cup while holding the helmet in place until you have a tight and comfortable fit that exerts even pressure around the ears.
3. Usage Mode (Fig. 3): Ensure the cups and attachment arms are not in contact with the inner lining or the edge of the hard hat when in the "usage" position, otherwise this may lead to leakage of sound.
4. Stand-by Mode (Fig. 4): For temporary breaks or when not actively needing hearing protection, the earmuffs can be tilted upwards to a stand-by position without removing the helmet.

Image: Visual guide demonstrating the four steps for attaching and adjusting the earmuffs on a hard hat, from inserting the adapters to positioning for use and stand-by.

4. Operating Instructions

4.1 Power On/Off

• To power on, press and hold the power button until you hear an audible prompt.
• To power off, press and hold the power button until you hear an audible prompt and the indicator light turns off.

4.2 Bluetooth Connection

The earmuffs utilize Bluetooth 5.3 technology for a stable and wide operating range.

1. Ensure the earmuffs are powered on and in pairing mode (usually indicated by a flashing LED).
2. On your mobile phone, computer, or tablet, navigate to the Bluetooth settings.
3. Select "GREEN DEVIL Shield LD HM" from the list of available devices to connect.
4. Once connected, you will hear a confirmation tone.

4.3 Smart Active Listening (SAL)

The built-in surround microphones and SAL function allow you to maintain situational awareness by capturing and transmitting ambient sounds to the earcups. This protects you from harmful loud noises while still allowing you to hear important environmental sounds.

• Adjust the volume of ambient sounds using the dedicated controls on the earmuffs.
• The system automatically suppresses harmful noise levels above a safe threshold.

4.4 Hands-Free Telephony and Audio Playback

With the noise-canceling boom microphone, you can make and receive calls hands-free without removing your hearing protection.

• Answering/Ending Calls: Use the call control button on the earmuffs to answer or end incoming calls.
• Music Playback: Control music playback (play, pause, skip tracks) using the integrated buttons.
• Volume Adjustment: Adjust the volume for calls and music using the volume controls.

4.5 Wired Connection

For a stable, wired audio experience, use the included 3.5mm AUX cable.

• Connect one end of the 3.5mm AUX cable to the earmuffs' audio input port.
• Connect the other end to your audio device's 3.5mm output jack.

Image: Illustration showing both wired (AUX mode for stability) and wireless (Bluetooth mode for freedom) connection options for the earmuffs.

5. Maintenance

• When not in use, turn off the earmuffs and disconnect them from any power source.
• Store the earmuffs in a cool, dry place, away from high temperatures and direct sunlight.
• Clean the earcups and headband regularly with a soft, damp cloth. Avoid using harsh chemicals or abrasive materials.
• Inspect the earmuffs periodically for any signs of wear or damage, especially the ear cushions and headband. Replace worn parts as necessary to maintain optimal performance and protection.

6. Troubleshooting

6.1 No Power

• Ensure the earmuffs are fully charged using the provided USB Type-C cable.
• Check the charging cable and power adapter for any damage.

6.2 Cannot Connect via Bluetooth

• Make sure the earmuffs are in pairing mode (refer to section 4.2).
• Ensure Bluetooth is enabled on your device and it is within the operating range (up to 80ft).
• Try forgetting the device from your Bluetooth settings and re-pairing.
• Restart both the earmuffs and your device.

6.3 Poor Sound Quality or No Sound

• Check the volume levels on both the earmuffs and your connected device.
• If using a wired connection, ensure the 3.5mm AUX cable is securely connected at both ends.
• For Bluetooth, ensure there are no obstructions between the earmuffs and your device, and that you are within range.
• If using the active listening feature, ensure it is properly adjusted and not muted.

6.4 Microphone Not Working

• Ensure the boom microphone is securely attached to the earmuffs.
• Check microphone settings on your connected device to ensure the earmuffs' microphone is selected as the input device.

7. Specifications

8. Warranty and Support

For any questions regarding your GREEN DEVIL Shield LD HM Bluetooth Hearing Protection Earmuffs, please contact GREEN DEVIL customer support. Our team is dedicated to providing assistance and ensuring your satisfaction with our products.

Please refer to the product packaging or the official GREEN DEVIL website for specific warranty details and contact information.