3M 90573-DC
3M WorkTunes Connect + Solar Wireless Hearing Protector User Manual
Model: 90573-DC | Brand: 3M
1. Introduction
The 3M WorkTunes Connect + Solar Wireless Hearing Protector is designed to provide hearing protection while allowing audio streaming and call functionality via Bluetooth technology. It features a Powerfoyle Solar Cell for continuous charging in various light conditions and offers a 26 dB Noise Reduction Rating (NRR).

Image: 3M WorkTunes Connect + Solar Wireless Hearing Protector headphones and packaging.
2. Key Features
- Continuous Charging: Integrated Powerfoyle Solar Cell charges the device using outdoor or indoor light.
- Hearing Protection: Provides a 26 dB Noise Reduction Rating (NRR) to help protect against hazardous noise levels.
- Bluetooth Connectivity: Connects to Bluetooth-enabled devices for streaming audio and managing calls.
- Premium Sound Quality: Equipped with high-fidelity speakers for clear audio.
- Safe Volume Control: Features a self-adjusting volume limiter to maintain safe listening levels.
- Water and Sweat Resistant: Designed for durability in various working conditions.
- Built-in Rechargeable Battery: Offers over 40 hours of reserve battery life when light is unavailable.
- Audio-Assist Technology: Provides operational setup and guidance through audio prompts.
- Intelligent Background-Noise Reduction: Enhances call clarity in noisy environments.
- On-Headset Volume Control: Allows for easy volume adjustments directly on the headset.

Image: A person wearing the 3M WorkTunes Connect + Solar headphones while operating a leaf blower, demonstrating continuous charging via solar power.

Image: A person wearing the 3M WorkTunes Connect + Solar headphones while operating a riding lawnmower, highlighting hearing protection.
3. Setup
3.1 Initial Charging
Before first use, ensure the hearing protector is adequately charged. The integrated Powerfoyle Solar Cell charges continuously in ambient light. For initial or rapid charging, connect the device to a USB power source using the provided charging cable.
- Locate the charging port on the headset.
- Connect the USB charging cable to the port and to a compatible USB power adapter.
- Allow the device to charge until the battery indicator shows a full charge.

Image: The 3M WorkTunes Connect + Solar headphones resting on a windowsill, symbolizing the 40-hour battery reserve and solar charging capability.
3.2 Bluetooth Pairing
To connect your hearing protector to a mobile device:
- Ensure the hearing protector is powered off.
- Press and hold the Power/Bluetooth button until the indicator light flashes blue and red, indicating pairing mode.
- On your mobile device, navigate to Bluetooth settings and select "3M WorkTunes Connect" from the list of available devices.
- Once connected, the indicator light will turn solid blue.

Image: A person wearing the 3M WorkTunes Connect + Solar headphones and interacting with a smartphone, illustrating Bluetooth connectivity.
4. Operating Instructions
4.1 Power On/Off
- Power On: Press and hold the Power/Bluetooth button until the indicator light illuminates.
- Power Off: Press and hold the Power/Bluetooth button until the indicator light turns off.
4.2 Volume Control
Adjust the listening volume using the dedicated volume buttons on the headset.
- Increase Volume: Press the Volume Up button.
- Decrease Volume: Press the Volume Down button.

Image: A person adjusting the volume control on the 3M WorkTunes Connect + Solar headphones, demonstrating the safe volume limiter feature.
4.3 Call Management
- Answer/End Call: Press the Power/Bluetooth button once.
- Reject Call: Press and hold the Power/Bluetooth button.
4.4 Audio Playback
- Play/Pause: Press the Power/Bluetooth button once.
- Next Track: Double-press the Power/Bluetooth button.
- Previous Track: Triple-press the Power/Bluetooth button.

Image: A person wearing the 3M WorkTunes Connect + Solar headphones while using a string trimmer, emphasizing premium sound quality.
5. Maintenance
5.1 Cleaning
- Wipe the exterior surfaces with a soft, damp cloth.
- Do not use abrasive cleaners or solvents.
- Ensure the charging port is free of debris.
5.2 Storage
- Store the hearing protector in a cool, dry place away from direct sunlight when not in use.
- Avoid extreme temperatures.

Image: A woman wearing the 3M WorkTunes Connect + Solar headphones outdoors, indicating water and sweat resistance.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | Low or depleted battery. | Charge the device using the USB cable or expose to light for solar charging. |
| Cannot pair via Bluetooth. | Device not in pairing mode; Bluetooth off on mobile device; too far from device. | Ensure device is in pairing mode (flashing blue/red). Turn on Bluetooth on your mobile device. Move closer to the hearing protector. |
| No audio or low volume. | Volume too low; device not connected; audio source paused. | Increase volume on both the hearing protector and the connected device. Verify Bluetooth connection. Check audio source playback. |
| Poor call clarity. | Excessive background noise; microphone obstructed. | Ensure microphone is clear. The device features Intelligent Background-Noise Reduction, but extreme noise may still affect clarity. |
7. Specifications
| Feature | Detail |
|---|---|
| Model Number | 90573-DC |
| Noise Reduction Rating (NRR) | 26 dB |
| Power Source | Powerfoyle Solar Cell, Built-in Rechargeable Battery |
| Battery Reserve | 40+ hours |
| Connectivity | Bluetooth Wireless Technology |
| Water Resistance | Water and sweat resistant |
| Item Weight | 1.04 pounds |
| Product Dimensions | 9.63 x 7 x 4 inches |
| Color | Black |
| Material | Assorted Materials |

Image: Diagram of the 3M WorkTunes Connect + Solar headphones with labeled components: A. Solar Cell, B. Headband, C. Power/Bluetooth Button, D. Volume Up/Down, E. Microphone, F. Charging Port.

Image: Chart illustrating common sound decibel levels and the risk of hearing damage above 85 dB. Prolonged exposure to noise over 85 dB can cause hearing damage.
8. Warranty and Support
This product is covered by a manufacturer's warranty. For specific warranty details, please refer to the warranty card included with your product or visit the official 3M website. For technical support, product inquiries, or service, please contact 3M customer service.
Online Support: Visit www.3m.com
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