1. Introduction
The Tbest 4G LTE USB WiFi Hotspot Router Modem Stick is a portable device designed to provide high-speed wireless internet access. It functions as both a 4G LTE USB modem and a Wi-Fi hotspot, allowing multiple users to connect simultaneously. This manual will guide you through the setup, operation, and maintenance of your device.
2. Safety Information
- Do not expose the device to extreme temperatures, direct sunlight, or high humidity.
- Avoid dropping or subjecting the device to strong impacts.
- Keep the device away from water and other liquids.
- Use only compatible power sources (5V/1A) to prevent damage.
- Do not attempt to disassemble or repair the device yourself. Contact qualified personnel for service.
3. Package Contents
- 1 x Tbest 4G LTE USB WiFi Hotspot Router Modem Stick
- 1 x English User Manual
4. Product Overview
The device features a compact design with a USB 2.1 interface for connection to a power source or computer. It includes slots for a SIM card and a TF (Micro SD) card for expandable storage.


5. Setup
5.1 Inserting the SIM Card
- Carefully remove the back cover of the device.
- Locate the SIM card slot. This device requires a standard-sized SIM card (approximately 15x25mm).
- Insert your 4G LTE SIM card into the designated slot, ensuring the gold contacts face downwards and the notched corner aligns correctly.
- If your SIM card has a PIN verification enabled, you may need to disable it using a mobile phone before inserting it into the modem stick. The device may not recognize SIM cards with active PINs.
- Replace the back cover.
5.2 Connecting the Device
- Plug the USB modem stick into an available USB 2.1 port on your computer (laptop, desktop) or a compatible USB power adapter (5V/1A).
- The device is designed for plug-and-play operation. It should automatically install necessary drivers on compatible operating systems.

6. Operating Instructions
6.1 Establishing Internet Connection
Once plugged in, the device will automatically attempt to connect to the 4G LTE network using the inserted SIM card. The indicator lights on the device will show its status (e.g., network signal strength, Wi-Fi activity).
6.2 Connecting Devices via Wi-Fi
The modem stick creates a Wi-Fi hotspot, allowing up to 8 devices to connect simultaneously. The Wi-Fi network name (SSID) and password are typically found on a label inside the device or on the packaging. Refer to your device's specific label for this information.
- On your Wi-Fi enabled device (smartphone, tablet, laptop), search for available Wi-Fi networks.
- Select the SSID corresponding to your Tbest modem stick.
- Enter the Wi-Fi password when prompted.
- Your device should now be connected to the internet through the hotspot.

6.3 Data Transmission Speed
The device supports ultra-fast wireless connection speeds of up to 150 Mbps (download) and 50 Mbps (upload), providing a smooth experience for web browsing, chatting, and online video streaming.
6.4 Supported Operating Systems
The modem stick is compatible with 32/64-bit versions of Windows 2000/2003/XP/Vista/7/10, OS 10.4 or lower, Linux, RouterOS, Cisco IOS, and Junos OS. Note: It is not compatible with Windows 8.
7. Maintenance
- Keep the device clean and free from dust. Use a soft, dry cloth for cleaning.
- Store the device in a cool, dry place when not in use.
- Ensure proper ventilation when the device is operating to prevent overheating.
8. Troubleshooting
8.1 Device Not Recognized / No Internet Connection
- Check SIM Card: Ensure the SIM card is correctly inserted and that its frequency band (FDD: B1/B3, WCDMA: 2100 MHz) is supported by the device and your local network provider.
- Disable SIM PIN: If the device does not recognize the SIM card, check if SIM card PIN verification is enabled. Disable the PIN using a mobile phone if necessary.
- Power Source: Ensure the device is receiving adequate power from the USB port or adapter.
- Driver Installation: On Windows, ensure drivers are installed automatically. If not, check Device Manager for unrecognized devices.
8.2 Slow Connection Speed
- Signal Strength: Move to an area with better 4G LTE signal coverage.
- Number of Users: The device supports up to 8 Wi-Fi users. Performance may degrade with more connected devices or heavy usage.
- Network Congestion: Network speeds can vary based on your service provider and local network traffic.
8.3 Wi-Fi Connection Issues
- Correct Password: Double-check that you are entering the correct Wi-Fi password.
- Device Proximity: Ensure your Wi-Fi device is within range of the hotspot.
- Restart Device: Try unplugging and re-plugging the modem stick to restart it.
9. Specifications
| Feature | Detail |
|---|---|
| Model Number | Tbestwykvi5sfxb-01 |
| Frequency Bands | LTE-FDD: B1/B3, WCDMA: 2100MHz |
| Wireless Standard | IEEE802.11b/g/n (Wi-Fi 4) |
| Wi-Fi Frequency | 2.4GHz |
| Data Transmission Speed | DL 150Mbps / UL 50Mbps |
| Max Wi-Fi Users | 8 |
| External Interface | USB 2.1, Micro SD (TF) Card Slot (up to 32GB) |
| Input Voltage | 5V/1A |
| Power Consumption | <=2W |
| WLAN Security Modes | Open, WPA-PSK, WPA2-PSK (WPA3 mentioned in some specifications, check device for exact support) |
| Dimensions (L x W x H) | 95 x 35 x 12 mm (3.7 x 1.4 x 0.5 inches) |
| Antenna Type | Internal |
| Compatible OS | Windows 2000/2003/XP/Vista/7/10 (32/64-bit), OS 10.4 or lower, Linux, RouterOS, Cisco IOS, Junos OS (Not compatible with Windows 8) |

10. Official Product Video
11. Warranty and Support
This product is subject to a 30-day return and replacement policy. For any issues or inquiries regarding your Tbest 4G LTE USB WiFi Hotspot Router Modem Stick, please contact the seller or refer to the product's purchase platform for support options. Ensure you have your purchase details and model number (Tbestwykvi5sfxb-01) ready when seeking assistance.