1. Introduction
This manual provides essential information for the safe and effective use of your GUENZO K28 Bluetooth Modular Motorcycle Helmet. Please read these instructions thoroughly before using the helmet to ensure proper operation, maintenance, and safety.
2. Safety Information
The GUENZO K28 Bluetooth Modular Motorcycle Helmet complies with DOT FMVSS-218 safety standards, ensuring it meets stringent requirements for road use in the United States. The helmet features a high-strength ABS shell and an EPS cushioning layer designed to absorb impact and protect the wearer.
Always ensure the helmet is properly fitted and secured before riding. Never modify the helmet or its components, as this may compromise its protective capabilities and void certifications.
3. Package Contents
- Motorcycle Helmet x 1
- Bluetooth Headset (K28) x 1
- Helmet Head Cover x 1
- Clip Base for Bluetooth x 1
- Velcro Installation Package x 1
- Type-C Charging Cable x 1
- User Manual x 1
4. Helmet Features
4.1. Construction Materials
The helmet is constructed from a sturdy and durable ABS shell, complemented by a high-strength EPS buffer layer for impact absorption. The interior features a mesh cotton lining for comfort and breathability, and the exterior is finished with an environmental protection paint.
Image: Internal structure of the helmet, highlighting the protective layers and materials used in its construction, including the DOT certification.
4.2. Aerodynamic Design
The helmet features an aerodynamic design to reduce air resistance and wind noise during riding, contributing to a more comfortable and less fatiguing experience.
Image: Overview of helmet features including aerodynamic shape, removable interior, clear visor, and secure quick-release buckle.
4.3. Dual Visor System
The helmet is equipped with a dual visor system, including an HD outer lens and a built-in retractable sun visor. This allows for clear vision in various lighting conditions, providing protection from sun glare during the day and clear visibility at night.
Image: The helmet's dual visor system, featuring an outer clear lens and an integrated, retractable inner sun visor for adaptable vision.
4.4. Ventilation System
An excellent ventilation system is integrated with three strategically placed vents: a top vent, a tail vent, and a mouth vent. These allow for comfortable air circulation, preventing stuffiness and helping to keep the rider cool.
Image: Diagram showing the helmet's airflow system, with designated top, tail, and mouth vents for optimal air circulation.
4.5. Removable Inner Lining
The helmet features a soft, comfortable, and breathable inner lining that is completely removable and washable. This allows for easy cleaning and maintenance, ensuring the helmet remains fresh and odor-free.
4.6. Quick-Release Buckle
A quick-release buckle system is provided for easy and secure fastening and removal of the helmet.
5. Bluetooth K28 System
The K28 Bluetooth system is integrated into the helmet for communication and entertainment.
5.1. Bluetooth Specifications
- Bluetooth Chip: 5.3 (Advanced technology for low power consumption, stable connection, low latency, and stable signal)
- Battery: 1000mAH (Large capacity, fast charging)
- Battery Life: Approximately 21 hours
- Water Resistance: IPX6 deep waterproof, dustproof, and splashproof
- Display: HD LCD digital display
- Lighting: Integrated LED lighting
- Sound Effects: 6 preset EQ personalized sound effects (Natural, Classical, Rock, Jazz, Pop, Country)
Image: Key features of the K28 Bluetooth unit, including its battery capacity, LED light, Bluetooth 5.3 connectivity, and waterproof design.
5.2. Bluetooth Controls and Functions
Image: Detailed diagram of the K28 Bluetooth unit's controls, indicating the function of each button and port.
- Power On/Off, Play/Pause, Answer/Hang Up: Central button (often indicated by a phone icon or power symbol).
- Next Song/Volume Up: Rotate the central dial clockwise.
- Previous Song/Volume Down: Rotate the central dial counter-clockwise.
- Voice Assistant: Dedicated button for activating voice assistant.
- Lighting/EQ Sound Effect: Button to control LED lighting and cycle through EQ sound effects.
- Charging Port: Type-C port for charging.
6. Sizing Guide
To ensure proper fit, measure your head circumference according to the method provided in the size table. If the helmet size is not suitable after purchase, contact customer support for assistance with inner lining replacement.
| Size | Head Circumference (CM) | Head Circumference (Inches) |
|---|---|---|
| M | 57-58 | 22.44-22.83 |
| L | 59-60 | 23.22-23.62 |
| XL | 61-62 | 24.00-24.40 |
| XXL | 63-64 | 24.80-25.20 |
7. Setup
7.1. Helmet Fitment
- Place the helmet on your head, ensuring it sits snugly and evenly.
- Fasten the quick-release buckle securely under your chin. Adjust the strap so it is tight but comfortable, allowing no more than two fingers to fit between the strap and your chin.
- Check for proper fit: The helmet should not move freely when you shake your head. Your cheeks should feel pressure from the cheek pads.
7.2. Bluetooth K28 Installation
The K28 Bluetooth unit is designed for easy installation. Use the provided clip base and Velcro installation package to attach the unit to the side of your helmet. Ensure the speakers are positioned correctly inside the helmet, near your ears, and the microphone is placed in front of your mouth for clear communication.
8. Operating Instructions
8.1. Helmet Operation
- Modular Function: To open the front section of the helmet, locate the release mechanism (usually a button or lever near the chin bar) and activate it. Lift the chin bar upwards until it locks into place. To close, press the release mechanism again and lower the chin bar until it securely latches.
- Outer Visor: The clear outer visor can be raised or lowered manually. It typically has multiple detent positions.
- Inner Sun Visor: To deploy the inner sun visor, locate the slider or lever on the side of the helmet (usually on the left) and slide it down. To retract, slide it back up.
8.2. Bluetooth K28 Operation
- Power On/Off: Press and hold the central button until the LCD display illuminates/shuts off.
- Pairing: With the unit powered on, activate Bluetooth on your mobile device. Search for "K28" in the list of available devices and select it to pair. The LCD display will indicate successful connection.
- Making/Receiving Calls: Press the central button once to answer an incoming call. Press it again to end a call.
- Music Playback: Once paired, music from your device will play automatically. Press the central button once to play/pause.
- Volume Adjustment: Rotate the central dial clockwise to increase volume, counter-clockwise to decrease volume.
- Track Navigation: Rotate the central dial clockwise and hold for the next song. Rotate counter-clockwise and hold for the previous song.
- LED Lighting: Short press the Lighting/EQ button to turn the LED light on or off.
- EQ Sound Effects: Long press the Lighting/EQ button to cycle through the 6 preset sound effects.
- Voice Assistant: Press the dedicated voice assistant button to activate your phone's voice assistant (e.g., Siri, Google Assistant).
9. Maintenance
9.1. Helmet Cleaning
- Shell: Clean the helmet shell with a soft cloth, mild soap, and water. Avoid abrasive cleaners or solvents, as they can damage the finish and materials.
- Visors: Clean visors with a soft, damp cloth and mild soap. Do not use harsh chemicals. Allow to air dry.
- Inner Lining: The removable inner lining can be hand-washed with mild soap and water. Allow it to air dry completely before reinserting into the helmet.
9.2. Bluetooth K28 Care
- Charging: Charge the unit using the provided Type-C cable. Do not use chargers with voltage exceeding the recommended specifications.
- Water Exposure: While IPX6 rated, avoid prolonged submersion. Ensure the charging port cover is securely closed when not charging.
- Storage: Store the unit in a cool, dry place when not in use.
10. Troubleshooting
- Bluetooth not connecting: Ensure the K28 unit is powered on and in pairing mode. Check that Bluetooth is enabled on your device and try re-pairing.
- No sound: Check the volume levels on both the K28 unit and your connected device. Ensure speakers are properly connected.
- Short battery life: Ensure the unit is fully charged before use. Battery performance may decrease over time with repeated charging cycles.
- Helmet fit issues: Refer to the sizing guide. If the fit is still uncomfortable, contact customer support for assistance with inner lining adjustments or replacements.
11. Specifications
11.1. Helmet Specifications
- Weight: Approximately 1400g
- Material: ABS shell, EPS buffer layer
- Certification: DOT FMVSS-218
- Suggested Users: Unisex-adult
11.2. Bluetooth K28 Specifications
- Bluetooth Version: 5.3
- Battery Capacity: 1000mAH
- Battery Life: Up to 21 hours
- Waterproof Rating: IPX6
- Display: HD LCD Digital Display
- Charging Port: Type-C
12. Warranty and Support
GUENZO is committed to providing high-quality products. If you have any questions or require assistance before purchase or after use, please contact our professional service team via email. We aim to respond and provide a solution within 12 hours of receiving your inquiry.
For specific warranty details, please refer to the documentation included with your purchase or contact customer support.