Introduction
This user manual provides essential information for the safe and effective use of your onerbl 19V 2A AC/DC Adapter. This adapter is designed as a high-quality replacement power supply for various Harman Kardon portable wireless Bluetooth speakers, including models HKOS4, HKONYXSTUDIOG4, HK Onyx Studio 4, and Harmon Kardon ONYX4. Please read this manual thoroughly before use.
Setup and Connection
Follow these steps to properly set up and connect your AC/DC adapter:
- Unpack the Adapter: Carefully remove the AC/DC adapter and its power cord from the packaging.
- Inspect for Damage: Before connecting, visually inspect the adapter and cables for any signs of damage (e.g., frayed wires, cracked casing). Do not use if damaged.
- Connect Power Cord: Connect the AC power cord to the adapter unit. Ensure it is firmly seated.
- Connect to Device: Plug the DC output connector of the adapter into the power input port of your compatible Harman Kardon speaker. Ensure the connector is fully inserted.
- Connect to Power Outlet: Plug the AC power cord into a standard wall outlet (AC 100-240V, 50/60Hz).

Image: The onerbl AC/DC adapter connected to a wall outlet and a device, demonstrating a typical setup.

Image: The onerbl 19V 2A AC/DC Adapter showing its main unit, detachable AC power cord, and DC output cable.
Operating Instructions
Once connected, the adapter will provide power to your compatible device. The blue indicator light on the adapter unit signifies that it is receiving power and operating correctly.
- Powering Your Device: The adapter is designed to deliver stable 19V 2A power to your Harman Kardon speaker, allowing it to operate or charge its internal battery.
- Charging Indication: Refer to your Harman Kardon speaker's user manual for specific charging indicators and battery status information.
- Safety Features: The adapter incorporates built-in protections against over-voltage, over-heat, and short-circuiting to ensure safe operation.
Maintenance and Care
Proper maintenance ensures the longevity and safe operation of your adapter:
- Cleaning: Disconnect the adapter from the power outlet and the device before cleaning. Use a soft, dry cloth to wipe the surface. Do not use liquid cleaners or abrasive materials.
- Storage: When not in use, store the adapter in a cool, dry place, away from direct sunlight and extreme temperatures. Avoid tightly coiling the cables to prevent damage.
- Cable Care: Do not bend, pinch, or pull the cables excessively. Avoid placing heavy objects on the cables.
- Environmental Conditions: Do not expose the adapter to water, high humidity, or dusty environments.
Troubleshooting
If you encounter issues with your adapter, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Adapter not powering device / No indicator light |
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| Adapter gets excessively hot |
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If the problem persists after trying these solutions, please contact customer support.
Product Specifications
| Feature | Detail |
|---|---|
| Model | onerbl 19V 2A AC/DC Adapter |
| Input Voltage | AC 100-240V, 50/60Hz (Worldwide Compatible) |
| Output Voltage | DC 19V |
| Output Current | 2A |
| Cable Length | Approximately 10 feet (3 meters) |
| Protection Features | Over Voltage Protection, Over Heat Protection, Short Circuit Protection |
| Product Dimensions | Approximately 6 x 4 x 2 inches (Adapter unit) |
| Manufacturer | Shenzhen Waweis Technology Co., Ltd |
| Country of Origin | China |

Image: Detailed diagram illustrating the dimensions of the adapter unit and the lengths of its connected cables.
Warranty and Support
This product is covered by a standard return policy. For specific warranty details and support, please refer to the seller's information on the purchase platform or contact the seller directly.
Seller: GreatComputerParts
Return Policy: 30 days (refund/replacement)
For technical assistance or inquiries, please reach out to the manufacturer or seller through the contact information provided at the point of purchase.





