Introduction
This manual provides essential instructions for the safe and effective use of your onerbl AC-DC Adapter. This adapter is designed to power or charge compatible devices, specifically the Riken Keiki RKI Instruments BC-2009 Gas Detector Charging Cradle, by converting AC power from electrical outlets to the required DC power. Please read this manual thoroughly before use and retain it for future reference.
Safety Information
- Ensure the adapter's voltage and current ratings match your device's requirements.
- Do not expose the adapter to water, moisture, or extreme temperatures.
- Avoid dropping or subjecting the adapter to severe impact.
- Do not attempt to disassemble or modify the adapter.
- Unplug the adapter from the power outlet when not in use or during electrical storms.
- Keep out of reach of children.
Product Overview
The onerbl AC-DC Adapter is a reliable power supply unit featuring over-voltage, over-heat, and short-circuit protection. It is designed for specific Riken Keiki RKI Instruments charging cradles.

Figure 1: Front view of the onerbl AC-DC Adapter, showing the main unit and attached barrel connector cable.

Figure 2: Front and side profiles of the adapter, highlighting its compact design.
Setup
- Verify Compatibility: Ensure your device, specifically the Riken Keiki RKI Instruments BC-2009 Gas Detector Charging Cradle, requires a 12V DC, 1.25A (15W) power supply with a barrel connector. Refer to your device's original specifications.
- Connect to Device: Insert the barrel connector end of the adapter cable firmly into the charging port of your Riken Keiki RKI Instruments BC-2009 Gas Detector Charging Cradle.
- Connect to Power Outlet: Plug the AC prongs of the adapter into a standard 110V AC electrical wall outlet.
- Power On: Once connected, your device should begin charging or receive power. Observe the device's charging indicator (if available) to confirm proper operation.

Figure 3: The adapter in use, providing power to a compatible device.
Operating Instructions
The onerbl AC-DC Adapter operates automatically once connected. It provides a stable 12V DC output at 1.25A to your compatible device. There are no user-adjustable settings on the adapter itself.
- Always ensure the adapter is securely plugged into both the wall outlet and the device.
- Disconnect the adapter from the power source when the device is fully charged or when not in use for extended periods.
- Do not cover the adapter during operation to allow for proper ventilation.
Maintenance
- Cleaning: Disconnect the adapter from all power sources before cleaning. Use a soft, dry cloth to wipe the exterior. Do not use liquid cleaners or solvents.
- Storage: Store the adapter in a cool, dry place away from direct sunlight and extreme temperatures. Avoid tightly coiling the cable to prevent damage.
- Inspection: Periodically inspect the adapter and cable for any signs of damage, such as frayed wires, cracks, or bent prongs. If damage is observed, discontinue use immediately.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device not charging/powering on. |
|
|
| Adapter feels unusually hot. |
|
|
Specifications
- Brand: onerbl
- Manufacturer: Shenzhen Waweis Technology Co., Ltd
- Input Voltage: 110V AC
- Output Voltage: 12V DC
- Output Current: 1.25 Amps
- Wattage: 15 Watts
- Connector Type: Barrel Connector
- Special Features: Over Voltage Protection, Over Heat Protection, Short Circuit Protection
- Color: Black

Figure 4: Physical dimensions of the adapter unit.
Warranty and Support
Specific warranty details are typically provided at the point of purchase or with the product packaging. For support inquiries, please refer to the contact information provided by your retailer or the manufacturer, Shenzhen Waweis Technology Co., Ltd.
For further assistance, please visit the onerbl brand page or contact your seller.