SENRN B1
SENRN Thumb Motion Camera User Manual
Model: B1
1. Introduction
The SENRN Thumb Motion Camera is a compact, high-definition sports recorder designed for capturing dynamic moments. Featuring a 0.96-inch full-view IPS color display, it provides clear, real-time viewing and playback. Its durable, fall-resistant, and IP54 waterproof ABS shell makes it suitable for various outdoor activities, including mountaineering, skiing, cycling, and skydiving.
Key features include 1080P HD video recording, 8MP photo resolution, loop recording functionality, and a built-in 380mAh lithium battery offering approximately 90 minutes of continuous operation. The camera also boasts a 150-degree wide-angle fisheye lens for immersive footage and a detachable sports back clip for versatile mounting options.

Image 1.1: The SENRN Thumb Motion Camera, emphasizing its HD 1080P sports camera capabilities, shown with a skier in the background.

Image 1.2: The camera is suitable for multiple scenarios, including extreme sports like skydiving and riding, as well as family activities and skiing.
2. Package Contents
Please verify that all items listed below are included in your package:
- 1 x Thumb Motion Camera
- 1 x 32GB Memory Card (if purchased with option B)
- 1 x Protective Case
- 1 x Camera Clip
- 1 x USB Data Cable
- 1 x Adapter
- 1 x Operation Instruction Manual

Image 2.1: All components included in the SENRN Thumb Motion Camera package.
3. Product Overview
Familiarize yourself with the various parts and features of your Thumb Motion Camera:

Image 3.1: Detailed diagram of the camera's components and their functions.
- Microphone: Captures audio during video recording.
- Lens: The primary camera lens with a 150-degree wide-angle view.
- Magnetic Attraction: Allows for easy attachment to magnetic surfaces or compatible accessories.
- Screen: 0.96-inch IPS color display for viewing live footage, recorded content, and settings.
- Shoot/Down Key: Used for taking photos or navigating menus downwards.
- Indicator Light: Provides status information (e.g., charging, recording).
- Switch Machine/Function Key: Used to power on/off the device and select functions.
- TF Card Slot: Insert your MicroSD (TF) card here (supports up to 128GB).
- USB Interface: For charging the camera and transferring data.

Image 3.2: The camera's 360-degree rotating magnetic design and included accessories like the silicone case and various clips.

Image 3.3: Camera dimensions and the detachable back clip design for easy use and installation.
4. Setup
4.1 Charging the Camera
Before first use, fully charge the camera. Connect the USB data cable to the camera's USB interface and the other end to a 5V power adapter or a computer's USB port.
- The indicator light will be red while charging.
- The indicator light will turn off or change color (depending on model) when fully charged.
A full charge provides approximately 90 minutes of continuous recording time at 1080P resolution.
4.2 Inserting the Memory Card
The camera supports TF (MicroSD) cards up to 128GB. A memory card is required for recording videos and photos.
- Locate the TF card slot on the side of the camera.
- Gently insert the TF card into the slot with the gold contacts facing down (or as indicated by the diagram on the camera) until it clicks into place.
- To remove the card, gently push it in again until it springs out.
Note: If the memory card is not included, please purchase a compatible TF card separately.
4.3 Attaching Accessories
The camera comes with a detachable sports back clip and a protective case. These can be attached as needed for various activities.
- Protective Case: Slide the camera into the protective case for added durability and protection.
- Sports Back Clip: Attach the back clip to the camera (or protective case) to easily clip it onto backpacks, pockets, or other gear. The magnetic feature allows for 360-degree rotation for flexible positioning.
5. Operating Instructions
5.1 Power On/Off
The camera features an independent switch for power control.
- To Power On: Press and hold the 'Switch machine/function key' until the screen lights up.
- To Power Off: Press and hold the 'Switch machine/function key' again until the screen turns off.
5.2 Video Recording
The camera has a dedicated button for video recording.
- To Start Recording: Press the dedicated video recording button (or 'Shoot/Down key' if it doubles as video start/stop). The indicator light will turn blue, indicating recording is in progress.
- To Stop Recording: Press the video recording button again. The indicator light will change from blue, indicating recording has stopped.
5.3 Taking Photos
To capture still images:
- Press the 'Shoot/Down key' once to take a photo. The screen may briefly flash or show a capture icon.
5.4 Loop Recording Function
The camera supports loop recording, which automatically overwrites the oldest files when the memory card is full, ensuring continuous recording without manual deletion.
- This feature is typically enabled by default. Refer to the on-screen menu for specific settings if available.
5.5 Playback
The built-in screen allows for direct playback of recorded videos and photos.
- Navigate to the playback mode using the function keys.
- Select the desired file to play or view.
6. Maintenance
Proper care will extend the life of your camera.
- Cleaning: Use a soft, dry cloth to clean the camera body. For the lens, use a specialized lens cleaning cloth and solution. Avoid abrasive materials or harsh chemicals.
- Waterproof Care: While the camera is IP54 waterproof, it is not designed for prolonged submersion. Ensure all ports are securely closed before exposure to water. Dry the camera thoroughly after exposure to moisture.
- Storage: Store the camera in a cool, dry place away from direct sunlight and extreme temperatures. Remove the memory card if storing for extended periods.
- Battery Care: For optimal battery life, avoid fully discharging the battery frequently. If storing for a long time, charge the battery to about 50% every few months.
7. Troubleshooting
If you encounter issues with your camera, try the following basic troubleshooting steps:
- Camera Not Turning On:
- Ensure the battery is charged. Connect the camera to a power source and check the charging indicator.
- Press and hold the power button for several seconds.
- Recording Issues (e.g., not recording, corrupted files):
- Check if the memory card is inserted correctly and has sufficient free space.
- Try formatting the memory card (this will erase all data, so back up important files first).
- Ensure the memory card is compatible (up to 128GB, Class 10 or higher recommended).
- Poor Video/Photo Quality:
- Clean the camera lens with a soft, lint-free cloth.
- Ensure adequate lighting in your recording environment.
- Screen Not Displaying Correctly:
- Restart the camera.
- Ensure the screen is clean and free from physical damage.
If problems persist, please contact customer support.
8. Specifications
| Feature | Specification |
|---|---|
| Product Name | Thumb Motion Camera |
| Brand | SENRN |
| Model | B1 |
| Material | ABS |
| Color | White, Black |
| Photo Resolution | 3760 x 2128 (8MP) |
| Video Resolution | 1920 x 1080P |
| Storage | Supports up to 128GB TF Card (Not Included) |
| Input Voltage | 5V |
| Interface | USB |
| Display | 0.96 inch IPS Color Screen |
| Battery | Built-in 380mAh Lithium Battery |
| Waterproof Rating | IP54 |
| Photo File Format | JPG |
| Product Size | 2.48 x 1.22 x 0.82 inches (63 x 31 x 21 mm) |
| Product Weight | 117g |
| Lens Type | Fisheye, Wide Angle (150-degree) |
| Photo Sensor Technology | CMOS |
9. Warranty and Support
For warranty information and customer support, please refer to the documentation provided with your purchase or contact the seller directly. Keep your purchase receipt as proof of purchase.
For further assistance, you may also visit the official SENRN website or contact their customer service channels.
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