Introduction
This manual provides essential instructions for the safe and effective use of your onerbl car charger, designed for Rand McNally RandTab 6, RandTab 7, and RandTab 8 tablets. Please read this manual thoroughly before use and retain it for future reference.
Product Overview

Figure 1: The onerbl car charger features a standard cigarette lighter plug on one end and a barrel connector on the other, connected by a black cable. This design facilitates power delivery from a vehicle's 12V accessory socket to compatible devices.
The onerbl car charger is specifically designed to provide power to your Rand McNally RandTab 6, RandTab 7, or RandTab 8 tablet via its OEM slice magnetic mount. It converts your vehicle's DC power into the necessary 5V DC for your device.
1. Setup Instructions
Follow these steps to properly connect your car charger to your Rand McNally tablet:
- Identify the Correct Port: Locate the DC socket on the OEM slice magnetic mount of your Rand McNally RandTab tablet. Important: This charger uses a barrel connector for the slice mount, not the GPS USB port.
- Connect to Tablet Mount: Insert the barrel connector end of the onerbl car charger firmly into the DC socket on your tablet's slice magnetic mount.
- Connect to Vehicle Power: Insert the cigarette lighter plug end of the car charger into your vehicle's 12V accessory power outlet (cigarette lighter socket).
- Verify Power: Once connected, your Rand McNally tablet should indicate that it is receiving power or charging.
Ensure all connections are secure before operating your vehicle.
2. Operating Instructions
The onerbl car charger is designed for straightforward operation:
- Automatic Charging: Once properly connected to both the tablet mount and the vehicle's power outlet, the charger will automatically begin supplying power to your Rand McNally tablet.
- Power Indicator: Your tablet's screen or LED indicator will show its charging status.
- Continuous Power: The charger provides continuous power, allowing you to operate your tablet while driving and simultaneously charge its internal battery.
- Disconnection: To disconnect, first remove the cigarette lighter plug from the vehicle's power outlet, then detach the barrel connector from the tablet's slice mount.
3. Maintenance and Care
To ensure the longevity and optimal performance of your car charger, follow these maintenance guidelines:
- Cleaning: Use a dry, soft cloth to clean the charger. Do not use liquid cleaners or solvents.
- Storage: When not in use, store the charger in a cool, dry place, away from direct sunlight and extreme temperatures.
- Cable Care: Avoid sharp bends, kinks, or excessive pulling on the cable. Do not wrap the cable too tightly around the charger.
- Inspection: Periodically inspect the charger and cable for any signs of damage, such as frayed wires or cracked casing. Discontinue use if damage is observed.
4. Troubleshooting
If you encounter issues with your car charger, refer to the following common problems and solutions:
- Charger Not Supplying Power:
- Ensure the vehicle's power outlet is functional. Test with another device if possible.
- Verify that the cigarette lighter plug is fully inserted into the vehicle's power outlet.
- Check that the barrel connector is securely plugged into the tablet's slice mount DC socket (not the USB port).
- Inspect the charger cable for any visible damage.
- Tablet Not Charging:
- Confirm the tablet's slice mount DC socket is clean and free of debris.
- Ensure the tablet itself is functioning correctly.
- The charger is specifically for the slice mount DC socket. If you are trying to charge via the tablet's USB port, this charger will not work.
- Loose Connection:
- Gently wiggle the connections at both ends to ensure a stable contact. If the connection remains loose, the vehicle's power outlet or the tablet's DC socket may be worn.
If problems persist after attempting these solutions, contact customer support.
5. Product Specifications
| Brand | onerbl |
| Compatible Devices | Rand McNally RandTab6, RandTab7, RandTab8 Tablet (6", 7", 8" inch) Truck Navigation GPS Slice Mount (Items 0528308297, 0528348191, 0528348183) |
| Connector Type | Barrel Connector |
| Input Voltage | 12-24 Volts DC (Vehicle Power Outlet) |
| Output Voltage | 5 Volts DC |
| Special Feature | Short Circuit Protection |
| Color | Black |
| Manufacturer | Shenzhen Waweis Technology Co., Ltd |
6. Warranty and Support
Information regarding specific warranty terms for this onerbl car charger was not provided in the product data. For warranty details or technical support, please refer to the documentation included with your purchase or contact the manufacturer directly.
Manufacturer: Shenzhen Waweis Technology Co., Ltd