1. Product Overview
The 3nStar SC550 is a hands-free, omni-directional 2D barcode scanner designed for high-volume retail environments such as convenience, drug, specialty, liquor, and grocery stores. Its compact and modern design allows for easy integration into existing point-of-sale (POS) systems. The SC550 offers powerful imaging capabilities, enabling it to scan various barcode types, including 1D and 2D codes, from both printed labels and digital screens.
Key features include omni-directional scanning for efficient hand presentation applications and automatic scanning operation, where barcodes are read upon presentation without manual trigger activation.

Image 1.1: The 3nStar SC550 Omni-Directional 2D Barcode Scanner in a typical retail setting, highlighting its compact design and scanning capabilities.
2. Package Contents
Verify that all items are present in the package:
- 3nStar SC550 Omni-Directional 2D Barcode Scanner
- USB Connection Cable
- Quick Start Guide (if applicable)
3. Setup Instructions
- Unpack the Scanner: Carefully remove the SC550 scanner from its packaging.
- Position the Scanner: Place the scanner on a stable, flat surface at your point-of-sale station. Ensure the scanning window is clear and unobstructed.

Image 3.1: Side view of the SC550 scanner, illustrating its compact form factor suitable for counter placement.
- Connect the USB Cable:
- Insert the smaller end of the USB cable into the designated port on the back or bottom of the SC550 scanner.
- Connect the larger end of the USB cable to an available USB port on your computer or POS system.
- Power On: The scanner typically powers on automatically once connected to a powered USB port. A confirmation sound or indicator light may activate.
- Driver Installation (if necessary): In most cases, the SC550 is a plug-and-play device and will be recognized automatically by your operating system (Windows, macOS, Linux). If prompted, follow the on-screen instructions for driver installation.
4. Operating Instructions
The 3nStar SC550 is designed for automatic, hands-free operation. Follow these steps to scan barcodes:
- Prepare the Item: Ensure the barcode on the item is clean, flat, and clearly visible.
- Present the Barcode: Hold the item with the barcode facing the scanning window of the SC550. Position the barcode within the scanner's field of view.

Image 4.1: Front view of the SC550, showing the scanning window where barcodes should be presented.
- Automatic Scan: The scanner will automatically detect and read the barcode. A successful scan is typically indicated by an audible beep and/or a visual confirmation light.
- Data Transmission: The scanned data will be transmitted to your connected computer or POS system as keyboard input.
The omni-directional scanning capability allows barcodes to be read regardless of their orientation, improving scanning speed and efficiency.
5. Maintenance
Proper maintenance ensures the longevity and optimal performance of your SC550 barcode scanner.
- Cleaning the Scanning Window:
- Regularly clean the scanning window with a soft, lint-free cloth.
- For stubborn smudges, lightly dampen the cloth with water or a mild, non-abrasive glass cleaner. Do not spray cleaner directly onto the scanner.
- Avoid using harsh chemicals, solvents, or abrasive materials, as these can damage the scanning surface.
- General Cleaning: Wipe the exterior of the scanner with a soft, damp cloth to remove dust and dirt.
- Cable Inspection: Periodically check the USB cable for any signs of wear, cuts, or damage. Replace damaged cables immediately to prevent malfunction.
- Environmental Considerations:
- Operate the scanner within its specified temperature and humidity ranges.
- Avoid exposing the scanner to direct sunlight for extended periods or extreme temperatures.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Scanner does not power on. | USB cable not properly connected or faulty USB port. | Ensure the USB cable is securely connected to both the scanner and the computer. Try a different USB port or computer. |
| Scanner does not read barcodes. |
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| Scanned data is incorrect or incomplete. |
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7. Specifications
| Feature | Detail |
|---|---|
| Model | SC550 |
| Scanning Capability | 1D and 2D Barcodes |
| Scanning Type | Omni-Directional, Hands-Free, Automatic |
| Connectivity | USB |
| Compatible Devices | Desktop, Laptop |
| Power Source | USB Powered |
| Operating Voltage | 5V DC (via USB) |
| Item Weight | 3 pounds (approximately 1.36 kg) |
| Manufacturer | 3nStar |
| UPC | 766394917309 |
Note: The scanner is primarily USB powered. The '110 Volts' mentioned in some general specifications typically refers to the input voltage for a power adapter, if an external one were used, not the scanner's direct operating voltage.
8. Warranty and Support
For warranty information and technical support, please refer to the documentation included with your product or visit the official 3nStar website. Keep your purchase receipt as proof of purchase for warranty claims.
You can find more information and contact details on the 3nStar Store on Amazon.





