1. Introduction
This manual provides detailed instructions for the FOSSIBOT F115 Ultra 5G Rugged Phone. It covers device setup, operation of advanced features such as thermal imaging and night vision, maintenance, troubleshooting, and full technical specifications. Please read this manual thoroughly before using your device to ensure proper function and safety.

Image: The FOSSIBOT F115 Ultra 5G Rugged Phone showcasing its thermal imaging and night vision capabilities.
2. Package Contents
Verify that all items are present in your product box:
- FOSSIBOT F115 Ultra Rugged Phone
- Hand Strap
- User Manual
- SIM Ejector Pin
- Screwdriver
- Screws
- Type-C Cable
- 33W Fast Charger
- USB OTG Adapter

Image: Contents of the FOSSIBOT F115 Ultra retail package.
3. Setup
3.1 SIM Card and MicroSD Card Installation
The FOSSIBOT F115 Ultra supports Dual Nano SIM cards or one Nano SIM card with one microSD card for expandable storage up to 2TB. Use the provided SIM ejector pin and screwdriver to open the SIM tray.
- Locate the SIM tray on the side of the phone.
- Use the provided screwdriver to loosen the screws securing the SIM tray cover.
- Carefully remove the SIM tray cover.
- Insert your Nano SIM card(s) and/or microSD card into the designated slots on the tray. Ensure the cards are correctly oriented.
- Replace the SIM tray cover and tighten the screws securely to maintain water and dust resistance.
3.2 Charging the Device
The F115 Ultra is equipped with a 20000mAh battery and supports 33W fast charging.
- Connect the Type-C cable to the charging port at the bottom of the phone.
- Connect the other end of the cable to the 33W fast charger.
- Plug the charger into a power outlet.
- The charging indicator will appear on the screen.
The device also supports 18W OTG reverse charging, allowing it to act as a power bank for other small electronic devices using the included USB OTG adapter.

Image: Overview of the F115 Ultra's battery and charging features.
3.3 Power On/Off
- To Power On: Press and hold the Power button until the FOSSIBOT logo appears.
- To Power Off: Press and hold the Power button, then select "Power off" from the options on the screen.
4. Operating Instructions
4.1 Display and User Interface
The F115 Ultra features a 6.78-inch FHD+ display with a 120Hz refresh rate and Corning Gorilla Glass for enhanced durability and smooth interaction. It runs on the latest Android 16 OS, providing a smart and efficient user experience.

Image: Details of the F115 Ultra's durable and high-quality display.
4.2 Advanced Camera Features
The F115 Ultra is equipped with a versatile camera system designed for various environments.
- Thermal Imaging: Detects heat signatures with temperature detection, 15 color filters, hot/cold area recognition, picture-in-picture mode, and edge enhancement. Monitoring range: -20°C to 550°C. Detection distance: 0.3m - 3m.
- 64MP 4K Night Vision Camera: Captures clear photos and videos up to 50m in complete darkness. Supports ultra-clear 4K recording.
- 10X Digital Zoom: For long-distance shooting and detailed observation.
- 50MP AI Main Camera: For high-resolution photos and videos in various modes.
- 32MP Front Camera: For clear selfies and video calls.

Image: Overview of the F115 Ultra's multi-camera system.
4.3 1200m Laser Rangefinder
The built-in laser rangefinder provides precise long-distance measurements up to 1200 meters. It includes 17 professional measuring modes for various applications, such as distance, height, angle, area, and volume measurement.

Image: Demonstrating the 1200m laser rangefinder in use.
4.4 Performance and Storage
Powered by the MediaTek Dimensity 7100+ 5G processor (up to 2.6GHz) and running Android 16, the F115 Ultra offers smooth performance for gaming and multitasking. It features 36GB RAM (12GB physical + 24GB virtual) and 256GB internal storage, expandable up to 2TB via a microSD card.

Image: The MediaTek Dimensity 7100+ 5G processor.
4.5 Connectivity and Navigation
The device supports 5G dual SIM connectivity. It includes NFC for contactless payments and data transfer, Bluetooth 5.4, and a 6-satellite positioning system (GPS, GLONASS, Galileo, Beidou, QZSS, NavIC) for high-accuracy tracking. A built-in speaker FM radio is also available.

Image: Connectivity and navigation features of the F115 Ultra.
4.6 Privacy and Security
The F115 Ultra includes a physical privacy button that directly cuts power to the microphone, ensuring your privacy cannot be compromised by software. It also features a side-mounted fingerprint sensor and face unlock for secure access.

Image: The physical microphone privacy switch.
4.7 Software Toolbox and Other Features
The device comes with a suite of useful software tools including a Compass, Sound Meter, Picture Hanging assistant, Gradienter, Height Measure, Magnifier, Protractor, Plumb Bob, Alarm Bell, Mirror, NFC Card Emulation, Pedometer, Flashlight, and Barometer. Other features include Glove Mode, Double-Tap to Wake, and the Gemini AI Assistant for enhanced interaction.

Image: The F115 Ultra's integrated software toolbox.
4.8 Product Video
Video: An official FOSSIBOT video showcasing the F115 Ultra's rugged features and powerful photography capabilities, including night vision in action.
5. Maintenance
To ensure the longevity and optimal performance of your FOSSIBOT F115 Ultra, follow these maintenance guidelines:
- Cleaning: Regularly wipe the phone with a soft, damp cloth. For stubborn dirt, use a mild soap solution. Ensure all ports are closed before cleaning with liquids.
- Water and Dust Resistance: The phone is IP68/IP69K rated. Ensure all port covers and the SIM tray cover are securely closed to maintain water and dust resistance. Do not intentionally submerge the phone in water beyond its rated depth or duration.
- Temperature: Avoid exposing the phone to extreme temperatures (very hot or very cold) for extended periods, as this can affect battery life and internal components.
- Impact Protection: While rugged, avoid unnecessary drops or impacts. The MIL-STD-810H certification provides protection against typical drops, but extreme force can still cause damage.
- Software Updates: Keep your device's software updated to ensure the latest security patches and performance improvements.

Image: The F115 Ultra's rugged protection features.
6. Troubleshooting
If you encounter issues with your FOSSIBOT F115 Ultra, try the following solutions:
- Device Not Turning On: Ensure the battery is charged. Connect the charger and wait a few minutes before attempting to power on again.
- Screen Unresponsive: Try a forced restart by pressing and holding the Power button for about 10-15 seconds.
- Network Issues (No Signal/Cannot Make Calls): Check if the SIM card is correctly inserted. Verify that mobile data and network settings are configured correctly. Contact your network provider to confirm service availability.
- Apps Crashing/Freezing: Close background applications. Clear the cache of the problematic app or reinstall it. If the issue persists, consider a factory reset (back up your data first).
- Battery Draining Quickly: Reduce screen brightness, disable unnecessary features like GPS, Wi-Fi, or Bluetooth when not in use. Check battery usage in settings to identify power-hungry apps.
- Water/Dust Damage Concerns: If you suspect water or dust ingress due to an open port or cover, power off the device immediately and allow it to dry completely before attempting to use it again. Do not charge a wet device.
7. Specifications
| Feature | Specification |
|---|---|
| Brand | FOSSIBOT |
| Model Name | FOSSIBOT F115 Ultra |
| Operating System | Android 16 |
| CPU Model | Mediatek Dimensity 7300 |
| CPU Speed | 2.6 GHz |
| RAM Memory Installed Size | 36 GB |
| Memory Storage Capacity | 256 GB |
| Flash Memory Supported Size Maximum | 2 TB (via microSD) |
| Screen Size | 6.78 inches |
| Resolution | 2340 x 1080 |
| Refresh Rate | 120 Hz |
| Rear Camera Resolution | 64 MP |
| Front Camera Resolution | 32 MP |
| Digital Zoom | 10 x |
| Video Capture Resolution | 4K |
| Battery Power | 20000 mAh (80 watt-hours) |
| Phone Talk Time | 175 hours |
| Water Resistance Level | Waterproof (IP68/IP69K) |
| Durability Standard | MIL-STD-810H |
| SIM Card Slot Count | Dual SIM |
| Connectivity Technology | 5G, NFC, Bluetooth 5.4 |
| GPS Geotagging Functionality | True (GPS, GLONASS, Galileo, Beidou, QZSS, NavIC) |
| Connector Type | USB Type C |
| Model Year | 2026 |
8. Warranty and Support
The FOSSIBOT F115 Ultra comes with a 2-year official warranty. FOSSIBOT offers a 30-day hassle-free return policy and 24/7 customer support for any inquiries or assistance you may need.
For support, please refer to the contact information provided with your purchase or visit the official FOSSIBOT website.