1. Introduction
This user manual provides comprehensive instructions for the Zyyini MF800 4G Router, a portable 4G LTE modem designed to offer high-speed internet access. This device allows you to share your internet connection with up to 10 devices simultaneously, making it ideal for travel, business, camping, and home use. Please read this manual carefully before using the device to ensure proper operation and to maximize its performance.

Figure 1: Front view of the Zyyini MF800 4G Router, showing the LED screen and 4G LTE branding.
2. Product Overview
The Zyyini MF800 4G Router is a compact and portable device engineered for reliable mobile internet connectivity. Key features include:
- High-Speed Internet Access: Supports 3G and 4G main bands, providing speeds up to 150Mbps.
- Multi-Device Connectivity: Share your internet connection with up to 10 devices simultaneously.
- Easy Setup: Simply insert a standard SIM card to establish a connection.
- LED Smart Screen: Features an LED display for status indication.
- Long-Lasting Battery: Equipped with a 2100mAh rechargeable battery for extended use.
- Compact Design: Slim and portable, making it easy to carry anywhere.

Figure 2: The router's capabilities, including 3G/4G high-speed internet access and support for up to 10 devices.
3. What's in the Box
Upon opening the package, please verify that all the following items are included:
- 1 x 4G Router (MF800)
- 1 x 2100mAh Lithium Battery
- 1 x Charging Cable (USB)
- 1 x User Manual

Figure 3: All components included in the package: the 4G router, its battery, and the charging cable.
4. Specifications
Feature | Description |
---|---|
Model Number | Zyyinieha2g4u3xr (MF800) |
Network Frequency Band | B1/3/5/7/8/20/40 (Europe/Asia) |
Network Type | 4G LTE, 3G |
Max Rate | 150Mbps (Download) |
Supported Protocol | 802.11ac |
WiFi Frequency | 2.4G |
Firewall | Inbuilt Firewall |
Battery | 2100mAh Lithium Battery |
SIM Card Slot | Standard SIM Card (not included) |
Connectivity | 4G, 4G LTE, Wi-Fi |
Compatible Devices | Personal Computer, Mobile Phones, Tablets |
Dimensions | 4.33 x 2.76 x 1.57 inches |
Item Weight | 3 pounds |
5. Setup Guide
Follow these steps to set up your Zyyini MF800 4G Router:
- Insert the Battery: Open the back cover of the router. Carefully insert the provided 2100mAh lithium battery into its compartment, ensuring the contacts align correctly.
- Insert the SIM Card: Locate the standard SIM card slot. Gently insert your activated standard SIM card into the slot until it clicks into place. Ensure the SIM card is oriented correctly as indicated on the device. (Note: SIM card is not included and must be purchased separately.)
- Replace the Back Cover: Once the battery and SIM card are in place, securely close the back cover.
- Power On: Press and hold the power button (usually located on the side or front) for a few seconds until the LED screen illuminates. The device will begin to boot up and connect to the network.

Figure 4: View of the router with the back cover removed, showing the battery compartment and the standard SIM card slot for insertion.
6. Operating Instructions
Once your router is set up and powered on, follow these steps to connect your devices and manage your network:
- Network Connection: After powering on, the router will automatically search for and connect to the available 4G network. The LED screen will display network status indicators (e.g., signal strength, battery level, Wi-Fi status).
- Connect Devices via Wi-Fi:
- On your device (phone, laptop, tablet), go to Wi-Fi settings.
- Search for available Wi-Fi networks.
- Locate the network name (SSID) of your MF800 router. This information is typically found on a label inside the battery compartment or on the device packaging. (Example: SSID: 4G-MIFI-5CD)
- Enter the Wi-Fi password (WIFI KEY) when prompted. (Example: WIFI KEY: 1234567890)
- Once connected, your device will have internet access through the router.
- Accessing Router Settings (Optional):
- Connect a device to the router's Wi-Fi.
- Open a web browser and enter the router's IP address (e.g., 192.168.100.1) into the address bar.
- Log in using the default username and password (e.g., User admin, Password admin). This information is usually found on the label inside the battery compartment.

Figure 5: Internal label of the router displaying important network information such as Model, IP address, User admin, Password admin, SSID, and WIFI KEY.
7. Maintenance
To ensure the longevity and optimal performance of your Zyyini MF800 4G Router, please observe the following maintenance guidelines:
- Cleaning: Use a soft, dry cloth to clean the exterior of the device. Do not use liquid cleaners or aerosols.
- Storage: Store the router in a cool, dry place away from direct sunlight, extreme temperatures, and humidity.
- Battery Care:
- Avoid fully discharging the battery frequently.
- Charge the battery using only the provided charging cable and a compatible power adapter.
- If storing for extended periods, charge the battery to about 50% and recharge every few months.
- Avoid Physical Damage: Protect the device from drops, impacts, and excessive pressure.
- Ventilation: Ensure the device's ventilation openings are not blocked during operation to prevent overheating.
8. Troubleshooting
If you encounter issues with your Zyyini MF800 4G Router, refer to the following common problems and solutions:
Problem | Possible Cause / Solution |
---|---|
No Internet Connection |
|
Cannot Connect to Wi-Fi |
|
Slow Internet Speed |
|
Router Not Turning On |
|
9. Warranty and Support
The Zyyini MF800 4G Router comes with a standard manufacturer's warranty. For specific warranty terms, duration, and conditions, please refer to the warranty card included in your product packaging or contact Zyyini customer support directly. Keep your purchase receipt as proof of purchase for warranty claims.
For technical support, troubleshooting assistance beyond this manual, or inquiries about replacement parts, please visit the official Zyyini website or contact their customer service department. Contact information can typically be found on the product packaging or the manufacturer's website.
Manufacturer: Zyyini
Model: Zyyinieha2g4u3xr (MF800)